Question 1: Palette 1/260

JEE Mains 2026 MCQ

Identify the correct statements :

The presence of –NO₂ group in benzene ring

A. activates the ring towards electrophilic substitutions.

B. deactivates the ring towards electrophilic substitutions.

C. activates the ring towards nucleophilic substitutions.

D. deactivates the ring towards nucleophilic substitutions.

Choose the correct answer from the options given below :

A

A and D Only

B

B and D Only

C

C and A Only

D

B and C Only

Question 2: Palette 2/260

JEE Mains 2026 MCQ

The cyclic cations having the same number of hyperconjugation are :

Choose the correct answer from the options given below :

A

B and C Only

B

A and B Only

C

A and C Only

D

A, C and D only

Question 3: Palette 3/260

JEE Mains 2026 MCQ

CORRECT order of stability for the following is

$\mathrm{CH}_2=\mathrm{CH}^{-}, \mathrm{CH}_3-\mathrm{CH}_2^{-}, \mathrm{CH} \equiv \mathrm{C}^{-}$

A

$\mathrm{CH} \equiv \mathrm{C}^{-}>\mathrm{CH}_3-\mathrm{CH}_2^{-}>\mathrm{CH}_2=\mathrm{CH}^{-}$

B

$\mathrm{CH}_2=\mathrm{CH}^{-}>\mathrm{CH} \equiv \mathrm{C}^{-}>\mathrm{CH}_3-\mathrm{CH}_2^{-}$

C

$\mathrm{CH} \equiv \mathrm{C}^{-}>\mathrm{CH}_2=\mathrm{CH}^{-}>\mathrm{CH}_3-\mathrm{CH}_2^{-}$

D

$\mathrm{CH}_3-\mathrm{CH}_2^{-}>\mathrm{CH}_2=\mathrm{CH}^{-}>\mathrm{CH} \equiv \mathrm{C}^{-}$

Question 4: Palette 4/260

JEE Mains 2026 MCQ

Given below are two statements :

Statement I : There are several conformers for n -butane. Out of those conformers,

Statement II : As the dihedral angle increases, torsional strain decreases from (X) to $(\mathrm{Y})$.

In the light of the above statements, choose the correct answer from the options given below

A

Statement I is false but Statement II is true

B

Both Statement I and Statement II are false

C

Statement I is true but Statement II is false

D

Both Statement I and Statement II are true

Question 5: Palette 5/260

JEE Mains 2026 MCQ

Find out the statements which are not true.

A. Resonating structures with more number of covalent bonds and lesser charge separation are more stable.

B. In electromeric effect, an unsaturated system shows +E effect with nucleophile and -E effect with electrophile.

C. Inductive effect is responsible for high melting point, boiling point and dipole moment of polar compounds.

D. The greater the number of alkyl groups attached to the doubly bonded carbon atoms, higher is the heat of hydrogenation.

E. Stability of carbanion increases with the increase in $\mathrm{s}-$ character of the carbon carrying the negative charge.

Choose the correct answer from the options given below :

A

A, D & E only

B

A, C & D only

C

B & D only

D

B, D & E only

Question 6: Palette 6/260

JEE Mains 2026 MCQ

$ \text { Arrange the following carbanions in the decreasing order of stability. } $

Choose the correct answer from the options given below :

A

I $>$ II $>$ IV $>$ V $>$ III

B

IV $>$ II $>$ I $>$ III $>$ V

C

$\mathrm{I}>\mathrm{IV}>\mathrm{II}>\mathrm{V}>\mathrm{III}$

D

IV $>$ I $>$ II $>$ V $>$ III

Question 7: Palette 7/260

JEE Mains 2026 MCQ

Given below are two statements :

Statement I : $\left(\mathrm{CH}_3\right)_3 \stackrel{\oplus}{\mathrm{C}}$ is more stable than $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_3$ as nine hyperconjugation interactions are possible in $\left(\mathrm{CH}_3\right)_3 \stackrel{\oplus}{\mathrm{C}}$.

Statement II : $\stackrel{\oplus}{\mathrm{C}}\mathrm{H}_3$ is less stable than $\left(\mathrm{CH}_3\right)_3 \stackrel{\oplus}{\mathrm{C}}$ as only three hyperconjugation interactions are possible in $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_3$.

In the light of the above statements, choose the correct answer from the options given below

A

Statement I is false but Statement II is true

B

Statement I is true but Statement II is false

C

Both Statement I and Statement II are true

D

Both Statement I and Statement II are false

Question 8: Palette 8/260

JEE Mains 2026 MCQ

Given below are two statements :

Statement I : Sublimation is used for the separation and purification of compounds with low melting point.

Statement II : The boiling point of a liquid increases as the external pressure is reduced. In the light of the above statements,

choose the correct answer from the options given below :

A

Both Statement I and Statement II are false

B

Statement I is true but Statement II is false

C

Both Statement I and Statement II are true

D

Statement I is false but Statement II is true

Question 9: Palette 9/260

JEE Mains 2026 MCQ

$ \text { The IUPAC name of the following compound is : } $

A

2-bromo-5-methylhexylpropanoate

B

n-propyl-1-bromo-4-methylhexanoate

C

n-propyl-2-bromo-5-methylheptanoate

D

2-bromo-5-methylpropanoate

Question 10: Palette 10/260

JEE Mains 2026 MCQ

Match List - I with List - II.

List - I Pair of Compounds	List - II Type of Isomers
A. 2-Methylpropene and but-1-ene	I. Stereoisomers
B. Cis-but-2-ene and trans-but-2-ene	II. Position isomers
C. 2-Butanol and diethyl ether	III. Chain isomers
D. But-1-ene and but-2-ene	IV. Functional group isomers

Choose the correct answer from the options given below :

A

A-III, B-I, C-IV, D-II

B

A-II, B-I, C-IV, D-III

C

A-I, B-IV, C-III, D-II

D

A-III, B-I, C-II, D-IV

Question 11: Palette 11/260

JEE Mains 2026 MCQ

Given below are four compounds :

(a) n-propyl chloride       (b) iso-propyl chloride

(c) sec-butyl chloride      (d) neo-pentyl chloride

Percentage of carbon in the one which exhibits optical isomerism is :

A

46

B

40

C

52

D

56

Question 12: Palette 12/260

JEE Mains 2026 MCQ

$ \text { From the following, the least stable structure is : } $

A

B

C

D

Question 13: Palette 13/260

JEE Mains 2026 MCQ

Identify correct statements from the following :

A. Propanal and propanone are functional isomers.

B. Ethoxyethane and methoxypropane are metamers.

C. But-2-ene shows optical isomerism.

D. But-1-ene and but-2-ene are functional isomers.

E. Pentane and 2, 2-dimethyl propane are chain isomers.

Choose the correct answer from the options given below :

A

A, B and E only

B

A, B and C only

C

C, D and E only

D

B, C and D only

Question 14: Palette 14/260

JEE Mains 2026 MCQ

Given below are two statements :

Statement I : Vapours of the liquid with higher boiling point condense before vapours of the liquid with lower boiling points in fractional distillation.

Statement II : The vapours rising up in the fractionating column become richer in high boiling component of the mixture.

In the light of the above statements, choose the correct answer from the options given below :

A

Both Statement I and Statement II are true

B

Both Statement I and Statement II are false

C

Statement I is true but Statement II is false

D

Statement I is false but Statement II is true

Question 15: Palette 15/260

JEE Mains 2026 MCQ

$ \text { The total number of aromatic compounds/species from the following is } $

A

6

B

4

C

3

D

5

Question 16: Palette 16/260

JEE Mains 2026 MCQ

Shown below is the structure of methyl acetate with three different $\alpha, \beta$ and $\gamma$ carbon - oxygen bonds.

The correct order of bond lengths of these bonds is :

A

$ \alpha>\beta>\gamma $

B

$ \alpha<\beta<\gamma $

C

$ \alpha=\beta=\gamma $

D

$ \alpha<\beta=\gamma $

Question 17: Palette 17/260

JEE Mains 2026 MCQ

Given below are two statements :

Statement I : On the basis of inductive effect, the order of stability of alkyl carbanions is $\mathrm{CH}_3{ }^{-}>\mathrm{CH}_3-\mathrm{CH}_2{ }^{-}>\left(\mathrm{CH}_3\right)_2 \mathrm{CH}^{-}>\left(\mathrm{CH}_3\right)_3 \mathrm{C}^{-}$.

Statement II : Allyl and benzyl carbanions are more stabilised by inductive effect and not by resonance effect.

In the light of the above statements, choose the correct answer from the options given below :

A

Both Statement I and Statement II are correct

B

Both Statement I and Statement II are incorrect

C

Statement I is correct but Statement II is incorrect

D

Statement I is incorrect but Statement II is correct

Question 18: Palette 18/260

JEE Mains 2026 MCQ

$ \text { Match the LIST-I with LIST-II } $

List-I Reaction		List-I Mechanism
A.	Williamson Synthesis	I.	Electrophilic addition
B.	Friedel Craft Reaction	II.	Free radical substitution
C.	Bromination of vinyl benzene	III.	Nucleophilic substitution
D.	Chlorination of toluene in light	IV.	Electrophilic substitution

Choose the correct answer from the options given below:

A

A-III, B-I, C-II, D-IV

B

A-III, B-IV, C-II, D-I

C

A-III, B-IV, C-I, D-II

D

 

A-I, B-III, C-IV, D-II

Question 19: Palette 19/260

JEE Mains 2026 MCQ

$ \text { Consider the following molecules/species : } $

$ \text { The correct order of carbon-oxygen double bond length is : } $

A

$ x>y>z $

B

$ \mathrm{y}>\mathrm{z}>x $

C

$ \mathrm{z}>x>\mathrm{y} $

D

$ x>\mathrm{z}>\mathrm{y} $

Question 20: Palette 20/260

JEE Mains 2026 MCQ

$ \text { The following structures are } $

A

enantiomers.

B

identical molecules.

C

diastereomers.

D

meso compounds.

Question 21: Palette 21/260

JEE Mains 2026 MCQ

$ \text { The descending order of acidity among the following compounds is : } $

Choose the correct answer from the options given below :

A

$ B>D>E>A>C $

B

$ \mathrm{D}>\mathrm{B}>\mathrm{E}>\mathrm{A}>\mathrm{C} $

C

$ C>A>B>D>E $

D

$ D>E>B>A>C $

Question 22: Palette 22/260

JEE Mains 2026 MCQ

$ \text { The strongest conjugate acid will result from : } $

A

B

C

D

Question 23: Palette 23/260

JEE Mains 2026 MCQ

Increasing order of electron withdrawing power of following functional groups is :

a. -CN

b. -COOH

c. $-\mathrm{NO}_2$

d. -I

A

$ \mathrm{c}<\mathrm{b}<\mathrm{d}<\mathrm{a} $

B

$ \mathrm{c}<\mathrm{a}<\mathrm{b}<\mathrm{d} $

C

$ \mathrm{d}<\mathrm{b}<\mathrm{a}<\mathrm{c} $

D

$ \mathrm{a}<\mathrm{b}<\mathrm{c}<\mathrm{d} $

Question 24: Palette 24/260

JEE Mains 2026 MCQ

Given below are two statements :

Statement I : In , the carbocation is stabilised by +R effect of –OCH₃ group.

Statement II : In , the carbanion is stabilised by –R effect of –NO₂ group.

In the light of the above statements, choose the correct answer from the options given below :

A

Both Statement I and Statement II are true

B

Both Statement I and Statement II are false

C

Statement I is true but Statement II is false

D

Statement I is false but Statement II is true

Question 25: Palette 25/260

JEE Mains 2026 MCQ

In IUPAC nomenclature, the correct order of decreasing priority of functional group is :

A

B

$ -\mathrm{CONH}_2,-\mathrm{COOCH}_3,-\mathrm{CHO},-\mathrm{NH}_2,-\mathrm{OH} $

C

D

$ -\mathrm{CONH}_2,-\mathrm{CHO},-\mathrm{CN},-\mathrm{NH}_2,-\mathrm{C} \equiv \mathrm{C}- $

Question 26: Palette 26/260

JEE Mains 2026 MCQ

For the given molecule, "x", the preferred site for the attack of the electrophile is :

A

Predominantly at "r"

B

"r" and "u"

C

"p" and "s"

D

Predominantly at "u"

Question 27: Palette 27/260

JEE Mains 2025 MCQ

Match the LIST-I with LIST-II

LIST-I	LIST-II
A. Carbocation	I. Species that can supply a pair of electrons.
B. C-Free radical	II. Species that can receive a pair of electrons.
C. Nucleophile	III. sp2 hybridized carbon with empty p-orbital.
D. Electrophile	IV. sp2/sp3 hybridized carbon with one unpaired electron.

Choose the correct answer from the options given below:

A

A-IV, B-II, C-III, D-I

B

A-II, B-III, C-I, D-IV

C

A-III, B-IV, C-I, D-II

D

A-III, B-IV, C-II, D-I

Question 28: Palette 28/260

JEE Mains 2025 MCQ

What is the correct IUPAC name of the compound?

A

1-Ethylcyclopent-2-en-3-ol

B

4-Ethylcyclopent-2-en-1-ol

C

1-Ethyl-3-hydroxycyclopent-2-ene

D

4-Ethyl-1-hydroxycyclopent-2-ene

Question 29: Palette 29/260

JEE Mains 2025 MCQ

The descending order of basicity of the following amines is :

(D) $ \mathrm{CH}_3 \mathrm{NH}_2$

(E) $\left(\mathrm{CH}_3\right)_2 \mathrm{NH}$

Choose the correct answer from the options given below :

A

E > A > D > C > B

B

E > D > A > B > C

C

E > D > B > A > C

D

B > E > D > A > C

Question 30: Palette 30/260

JEE Mains 2025 MCQ

The number of optically active products obtained from the complete ozonolysis of the given compound is :

A

4

B

0

C

2

D

1

Question 31: Palette 31/260

JEE Mains 2025 MCQ

Which of the following is the correct IUPAC name of given organic compound (X)?

A

4-Bromo-3-methylbut-2-ene

B

1-Bromo-2-methylbut-2-ene

C

3-Bromo-3-methylprop-2-ene

D

2-Bromo-2-methylbut-2-ene

Question 32: Palette 32/260

JEE Mains 2025 MCQ

The IUPAC name of the following compound is:

A

4-Hydroxyhept-6-en-1-yne

B

Hept-1-en-6-yn-4-ol

C

Hept-6-en-1-yn-4-ol

D

4-Hydroxyhept-1-en-6-yne

Question 33: Palette 33/260

JEE Mains 2025 MCQ

In which pairs, the first ion is more stable than the second?

A

(A) & (B) only

B

(B) & (D) only

C

(A) & (C) only

D

(B) & (C) only

Question 34: Palette 34/260

JEE Mains 2025 MCQ

The correct order of basicity for the following molecules is :

A

R > P > Q

B

P > Q > R

C

R > Q > P

D

Q > P > R

Question 35: Palette 35/260

JEE Mains 2025 MCQ

$ \text { What is the correct IUPAC name of } $

?

A

3-Bromo-2-hydroxy-5-nitrobenzoic acid

B

2-Hydroxy-3-bromo-5-nitrobenzoic acid

C

3-Bromo-4-hydroxy-1-nitrobenzoic acid

D

5-Nitro-3-bromo-2-hydroxybenzoic acid

Question 36: Palette 36/260

JEE Mains 2025 MCQ

Given below are two statements :

Statement I : Hyperconjugation is not a permanent effect.

Statement II : In general, greater the number of alkyl groups attached to a positively charged Cation, greater is the hyperconjugation interaction and stabilization of the cation.

In the light of the above statements, choose the correct answer from the options given below

A

Statement I is false but Statement II is true

B

Statement I is true but Statement II is false

C

Both Statement I and Statement II are false

D

Both Statement I and Statement II are true

Question 37: Palette 37/260

JEE Mains 2025 MCQ

$ \text {Identify the correct statements from the following. } $

$ \text {Choose the correct answer from the options given below: } $

A

B & C Only

B

C & D Only

C

A,B & C Only

D

A & B Only

Question 38: Palette 38/260

JEE Mains 2025 MCQ

$ \text { The least acidic compound, among the following is: } $

A

B

B

D

C

A

D

C

Question 39: Palette 39/260

JEE Mains 2025 MCQ

In 3,3-dimethylhex-1-en-4-yne, there are _________$\mathrm{sp}^3$,_________$\mathrm{sp}^2$ and_________ sp hybridised carbon atoms respectively.

A

$4,2,2$

B

$2,4,2$

C

$3,3,2$

D

$2,2,4$

Question 40: Palette 40/260

JEE Mains 2025 MCQ

Consider the following compound (X)

The most stable and least stable carbon radicals, respectively, produced by homolytic cleavage of corresponding $\mathrm{C}-\mathrm{H}$ bond are :

A

III, II

B

II, IV

C

I, IV

D

II, I

Question 41: Palette 41/260

JEE Mains 2025 MCQ

Designate whether each of the following compounds is aromatic or not aromatic.

A

$a, c, d, e, h$ aromatic and $b, f, g$ not aromatic

B

$b, e, f, g$ aromatic and $a, c, d, h$ not aromatic

C

$a, b, c, d$ aromatic and $e, f, g, h$ not aromatic

D

e, $g$ aromatic and $a, b, c, d, f, h$ not aromatic

Question 42: Palette 42/260

JEE Mains 2025 MCQ

Given below are two statements :

Statement (I): On nitration of m-xylene with $\mathrm{HNO}_3, \mathrm{H}_2 \mathrm{SO}_4$ followed by oxidation, 4-nitrobenzene-1,3-dicarboxylic acid is obtained as the major product.

Statement (II) : $-\mathrm{CH}_3$ group is o/p-directing while $-\mathrm{NO}_2$ group is m-directing group.

In the light of the above statements, choose the correct answer from the options given below :

A

Statement I is true but Statement II is false

B

Both Statement I and Statement II are true

C

Both Statement I and Statement II are false

D

Statement I is false but Statement II is true

Question 43: Palette 43/260

JEE Mains 2025 MCQ

Given below are two statements :

Statement (I): In partition chromatography, stationary phase is thin film of liquid present in the inert support.

Statement (II): In paper chromatography, the material of paper acts as a stationary phase.

In the light of the above statements, choose the correct answer from the options given below :

A

Statement I is true but Statement II is false

B

Statement I is false but Statement II is true

C

Both Statement I and Statement II are false

D

Both Statement I and Statement II are true

Question 44: Palette 44/260

JEE Mains 2025 MCQ

Match List - I with List - II.

List - I (Structure)	List - II (IUPAC Name)
(A)	(I) 4-Methylpent-1-ene
(B) (CH3)2C(C3H7)2	(II) 3-Ethyl-5-methylheptane
(C)	(III) 4,4-Dimethylheptane
(D)	(IV) 2-Methyl-1,3-pentadiene

Choose the correct answer from the options given below :

A

(A)-(II), (B)-(III), (C)-(IV), (D)-(I)

B

(A)-(II), (B)-(III), (C)-(I), (D)-(IV)

C

(A)-(III), (B)-(IV), (C)-(I), (D)-(II)

D

(A)-(III), (B)-(II), (C)-(I), (D)-(IV)

Question 45: Palette 45/260

JEE Mains 2025 MCQ

Total number of nucleophiles from the following is :

A

4

B

6

C

5

D

7

Question 46: Palette 46/260

JEE Mains 2025 MCQ

Given below are two statements:

Statement I: and are isomeric compounds.

Statement II: and are functional group isomers.

In the light of the above statements, choose the correct answer from the options given below:

A

Statement I is false but Statement II is true

B

Both Statement I and Statement II are true

C

Statement I is true but Statement II is false

D

Both Statement I and Statement II are false

Question 47: Palette 47/260

JEE Mains 2025 MCQ

The correct order of stability of following carbocations is :

A

A > B > C > D

B

C > B > A > D

C

B > C > A > D

D

C > A > B > D

Question 48: Palette 48/260

JEE Mains 2025 MCQ

In the given structure, number of sp and $\mathrm{sp}^2$ hybridized carbon atoms present respectively are :

A

3 and 5

B

3 and 6

C

4 and 5

D

4 and 6

Question 49: Palette 49/260

JEE Mains 2025 MCQ

Identify correct statement/s :

(A) $-\mathrm{OCH}_3$ and $-\mathrm{NHCOCH}_3$ are activating group.

(B) $\quad-\mathrm{CN}$ and -OH are meta directing group.

(C) -CN and $-\mathrm{SO}_3 \mathrm{H}$ are meta directing group.

(D) Activating groups act as ortho - and para directing groups.

(E) Halides are activating groups.

Choose the correct answer from the options given below :

A

$(A),(C)$ and (D) only

B

$(A),(B)$ and $(E)$ only

C

(A) and (C) only

D

(A) only

Question 50: Palette 50/260

JEE Mains 2025 MCQ

Which one of the carbocations from the following is most stable?

A

B

C

D

Question 51: Palette 51/260

JEE Mains 2025 MCQ

The correct stability order of the following species/molecules is :

A

$\mathrm{q>r>p}$

B

$\mathrm{q>p>r}$

C

$\mathrm{p}>\mathrm{q}>\mathrm{r}$

D

$\mathrm{r>q>p}$

Question 52: Palette 52/260

JEE Mains 2025 MCQ

The most stable carbocation from the following is :

A

B

C

D

Question 53: Palette 53/260

JEE Mains 2025 MCQ

How many different stereoisomers are possible for the given molecule?

A

2

B

1

C

3

D

4

Question 54: Palette 54/260

JEE Mains 2025 MCQ

The incorrect statements regarding geometrical isomerism are :

(A) Propene shows geometrical isomerism.

(B) Trans isomer has identical atoms/groups on the opposite sides of the double bond.

(C) Cis-but-2-ene has higher dipole moment than trans-but-2-ene.

(D) 2-methylbut-2-ene shows two geometrical isomers.

(E) Trans-isomer has lower melting point than cis isomer.

Choose the correct answer from the options given below :

A

(A) and (E) Only

B

(A), (D) and (E) Only

C

(C), (D) and (E) Only

D

(B) and (C) Only

Question 55: Palette 55/260

JEE Mains 2025 MCQ

The IUPAC name of the following compound is :

A

5-Methoxycarbonly-2-methylhexanoic acid

B

Methyl-5-carboxy-2-methylhexanoate.

C

2-Carboxy-5-methoxycarbonylhexane.

D

Methyl-6-carboxy-2,5-dimethylhexanoate.

Question 56: Palette 56/260

JEE Mains 2024 MCQ

The correct stability order of the following resonance structures of $\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{CHO}$ is

A

$\text { II }>\text { III }>\text { I }$

B

$\text { II }>\text { I }>\text { III }$

C

$\text { III }>\text { II }>\text { I }$

D

$\text { I }>\text { II }>\text { III }$

Question 57: Palette 57/260

JEE Mains 2024 MCQ

Total number of stereo isomers possible for the given structure :

A

4

B

2

C

8

D

3

Question 58: Palette 58/260

JEE Mains 2024 MCQ

Relative stability of the contributing structures is :

A

(II) > (I) > (III)

B

(III) > (II) > (I)

C

(I) > (III) > (II)

D

(I) > (II) > (III)

Question 59: Palette 59/260

JEE Mains 2024 MCQ

Correct order of basic strength of Pyrrole , Pyridine and Piperidine is :

A

Pyridine > Piperidine > Pyrrole

B

Pyrrole > Piperidine > Pyridine

C

Pyrrole > Pyridine > Piperidine

D

Piperidine > Pyridine > Pyrrole

Question 60: Palette 60/260

JEE Mains 2024 MCQ

For the given compounds, the correct order of increasing $\mathrm{pK}_{\mathrm{a}}$ value :

Choose the correct answer from the options given below :

A

(E) $<(\mathrm{D})<(\mathrm{C})<(\mathrm{B})<(\mathrm{A})$

B

(B) $<(\mathrm{D})<(\mathrm{A})<(\mathrm{C})<(\mathrm{E})$

C

(D) < (E) < (C) < (B) < (A)

D

(E) $<(\mathrm{D})<(\mathrm{B})<(\mathrm{A})<(\mathrm{C})$

Question 61: Palette 61/260

JEE Mains 2024 MCQ

Methods used for purification of organic compounds are based on :

A

neither on nature of compound nor on the impurity present.

B

presence of impurity only.

C

nature of compound and presence of impurity.

D

nature of compound only.

Question 62: Palette 62/260

JEE Mains 2024 MCQ

The correct sequence of acidic strength of the following aliphatic acids in their decreasing order is:

$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH}, \mathrm{CH}_3 \mathrm{COOH}, \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{COOH}, \mathrm{HCOOH}$

A

$\mathrm{HCOOH}>\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{COOH}>\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH}>\mathrm{CH}_3 \mathrm{COOH}$

B

$\mathrm{HCOOH}>\mathrm{CH}_3 \mathrm{COOH}>\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH}>\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{COOH}$

C

$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{COOH}>\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH}>\mathrm{CH}_3 \mathrm{COOH}>\mathrm{HCOOH}$

D

$\mathrm{CH}_3 \mathrm{COOH}>\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH}>\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{COOH}>\mathrm{HCOOH}$

Question 63: Palette 63/260

JEE Mains 2024 MCQ

IUPAC name of following hydrocarbon(X) is :

A

2,5,6-Trimethyloctane

B

2-Ethyl-2,6-diethylheptane

C

3,4,7-Trimethyloctane

D

2-Ethyl-3,6-dimethylheptane

Question 64: Palette 64/260

JEE Mains 2024 MCQ

Which of the following are aromatic?

A

B and D only

B

A and C only

C

C and D only

D

A and B only

Question 65: Palette 65/260

JEE Mains 2024 MCQ

Given below are two statements :

In the light of the above statements, choose the most appropriate answer from the options given below:

A

Both Statement I and Statement II are incorrect.

B

Both Statement I and Statement II are correct.

C

Statement I is correct but Statement II is incorrect.

D

Statement I is incorrect but Statement II is correct.

Question 66: Palette 66/260

JEE Mains 2024 MCQ

The correct arrangement for decreasing order of electrophilic substitution for above compounds is :

A

$\text { (III) }>\text { (IV) }>\text { (II) }>\text { (I) }$

B

$\text { (III) }>\text { (I) }>\text { (II) }>\text { (IV) }$

C

$\text { (II) }>\text { (IV) }>\text { (III) }>\text { (I) }$

D

$(\text { IV) }>\text { (I) }>\text { (II) }>\text { (III) }$

Question 67: Palette 67/260

JEE Mains 2024 MCQ

The incorrect statement regarding the geometrical isomers of 2-butene is :

A

cis-2-butene and trans-2-butene are not interconvertible at room temperature.

B

trans-2-butene is more stable than cis-2-butene.

C

cis-2-butene has less dipole moment than trans-2-butene.

D

cis-2-butene and trans-2-butene are stereoisomers.

Question 68: Palette 68/260

JEE Mains 2024 MCQ

Functional group present in sulphonic acids is :

A

$-$SO$_2$

B

C

$-\mathrm{SO_3H}$

D

$-\mathrm{SO_4H}$

Question 69: Palette 69/260

JEE Mains 2024 MCQ

Which of the following is metamer of the given compound (X) ?

A

B

C

D

Question 70: Palette 70/260

JEE Mains 2024 MCQ

The correct nomenclature for the following compound is :

A

2-carboxy-4-hydroxyhept-7-enal

B

2-formyl-4-hydroxyhept-7-enoic acid

C

2-carboxy-4-hydroxyhept-6-enal

D

2-formyl-4-hydroxyhept-6-enoic acid

Question 71: Palette 71/260

JEE Mains 2024 MCQ

Match List - I with List - II.

	LIST I (Pair of Compounds)		LIST II (Isomerism)
A.	n-propanol and Isopropanol	I.	Metamerism
B.	Methoxypropane and ethoxyethane	II.	Chain Isomerism
C.	Propanone and propanal	III.	Position Isomerism
D.	Neopentane and Isopentane	IV.	Functional Isomerism

Choose the correct answer from the options given below :

A

(A)-(II), (B)-(I), (C)-(IV), (D)-(III)

B

(A)-(III), (B)-(I), (C)-(II), (D)-(IV)

C

(A)-(III), (B)-(I), (C)-(IV), (D)-(II)

D

(A)-(I), (B)-(III), (C)-(IV), (D)-(II)

Question 72: Palette 72/260

JEE Mains 2024 MCQ

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Cis form of alkene is found to be more polar than the trans form.

Reason (R) : Dipole moment of trans isomer of 2-butene is zero.

In the light of the above statements, choose the correct answer from the options given below :

A

(A) is true but (R) is false

B

(A) is false but (R) is true

C

Both $(\mathbf{A})$ and $(\mathbf{R})$ are true and $(\mathbf{R})$ is the correct explanation of $(\mathbf{A})$

D

Both $(\mathbf{A})$ and $(\mathbf{R})$ are true but $(\mathbf{R})$ is NOT the correct explanation of $(\mathbf{A})$

Question 73: Palette 73/260

JEE Mains 2024 MCQ

Correct order of stability of carbanion is :

A

d > c > b > a

B

c > b > d > a

C

d > a > c > b

D

a > b > c > d

Question 74: Palette 74/260

JEE Mains 2024 MCQ

What will be the decreasing order of basic strength of the following conjugate bases? ${ }^{-} \mathrm{OH}, \mathrm{R} \overline{\mathrm{O}}, \mathrm{CH}_3 \mathrm{CO} \overline{\mathrm{O}}, \mathrm{Cl}$

A

$\mathrm{C} \overline{\mathrm{I}}>\mathrm{R} \overline{\mathrm{O}}>{ }^{-} \mathrm{OH}>\mathrm{CH}_3 \mathrm{CO} \overline{\mathrm{O}}$

B

${ }^{-} \mathrm{OH}>\mathrm{R} \overline{\mathrm{O}}>\mathrm{CH}_3 \mathrm{CO} \overline{\mathrm{O}}>\mathrm{C} \overline{1}$

C

$\mathrm{C} \overline{\mathrm{I}}>{ }^{-} \mathrm{OH}>\mathrm{R} \overline{\mathrm{O}}>\mathrm{CH}_3 \mathrm{CO} \bar{O}$

D

$\mathrm{R} \overline{\mathrm{O}}>{ }^{-} \mathrm{OH}>\mathrm{CH}_3 \mathrm{CO} \overline{\mathrm{O}}>\mathrm{C} \overline{1}$

Question 75: Palette 75/260

JEE Mains 2024 MCQ

Match List I with List II :

	LIST I Mechanism steps		LIST II Effect
A.		I.	$-$ E effect
B.		II.	$-$ R effect
C.		III.	$+$ E effect
D.		IV.	$+$ R effect

Choose the correct answer from the options given below :

A

(A) - (I), (B) - (II), (C) - (IV), (D) - (III)

B

(A) - (II), (B) - (IV), (C) - (III), (D) - (I)

C

(A) - (III), (B) - (I), (C) - (II), (D) - (IV)

D

(A) - (IV), (B) - (III), (C) - (I), (D) - (II)

Question 76: Palette 76/260

JEE Mains 2024 MCQ

Which among the following is incorrect statement?

A

The electromeric effect is, temporary effect

B

Hydrogen ion $(\mathrm{H}^{+})$ shows negative electromeric effect

C

The organic compound shows electromeric effect in the presence of the reagent only.

D

Electromeric effect dominates over inductive effect

Question 77: Palette 77/260

JEE Mains 2024 MCQ

The set of meta directing functional groups from the following sets is :

A

$-\mathrm{CN},-\mathrm{NH}_2,-\mathrm{NHR},-\mathrm{OCH}_3$

B

$-\mathrm{CN},-\mathrm{CHO},-\mathrm{NHCOCH}_3,-\mathrm{COOR}$

C

$-\mathrm{NO}_2,-\mathrm{NH}_2,-\mathrm{COOH},-\mathrm{COOR} $

D

$-\mathrm{NO}_2,-\mathrm{CHO},-\mathrm{SO}_3 \mathrm{H},-\mathrm{COR}$

Question 78: Palette 78/260

JEE Mains 2024 MCQ

Lassaigne's test is used for detection of :

A

Phosphorous and halogens only

B

Nitrogen, Sulphur and Phosphorous only

C

Nitrogen, Sulphur, phosphorous and halogens

D

Nitrogen and Sulphur only

Question 79: Palette 79/260

JEE Mains 2024 MCQ

The functional group that shows negative resonance effect is :

A

$-\mathrm{OH}$

B

$-\mathrm{OR}$

C

$-\mathrm{COOH}$

D

$-\mathrm{NH}_2$

Question 80: Palette 80/260

JEE Mains 2024 MCQ

Ionic reactions with organic compounds proceed through :

(A) homolytic bond cleavage

(B) heterolytic bond cleavage

(C) free radical formation

(D) primary free radical

(E) secondary free radical

Choose the correct answer from the options given below :

A

(A) only

B

(B) only

C

(C) only

D

(D) and (E) only

Question 81: Palette 81/260

JEE Mains 2024 MCQ

Which of the following compound will most easily be attacked by an electrophile?

A

B

C

D

Question 82: Palette 82/260

JEE Mains 2024 MCQ

Identify structure of 2,3-dibromo-1-phenylpentane.

A

B

C

D

Question 83: Palette 83/260

JEE Mains 2024 MCQ

The correct order of reactivity in electrophilic substitution reaction of the following compounds is :

A

B > C > A > D

B

B > A > C > D

C

D > C > B > A

D

A > B > C > D

Question 84: Palette 84/260

JEE Mains 2024 MCQ

A species having carbon with sextet of electrons and can act as electrophile is called

A

pentavalent carbon

B

carbon free radical

C

carbanion

D

carbocation

Question 85: Palette 85/260

JEE Mains 2024 MCQ

Given below are two statements:

Statement I: IUPAC name of $\mathrm{HO}-\mathrm{CH}_2-\left(\mathrm{CH}_2\right)_3-\mathrm{CH}_2-\mathrm{COCH}_3$ is 7-hydroxyheptan-2-one.

Statement II: 2-oxoheptan-7-ol is the correct IUPAC name for above compound. In the light of the above statements, choose the most appropriate answer from the options given below:

A

Statement I is incorrect but Statement II is correct.

B

Statement I is correct but Statement II is incorrect.

C

Both Statement I and Statement II are correct.

D

Both Statement I and Statement II are incorrect.

Question 86: Palette 86/260

JEE Mains 2024 MCQ

The correct stability order of carbocations is

A

$\left(\mathrm{CH}_3\right)_3 \mathrm{C}^{+}>\mathrm{CH}_3-\stackrel{+}{\mathrm{C}} \mathrm{H}_2>\left(\mathrm{CH}_3\right)_2 \stackrel{+}{\mathrm{C}} \mathrm{H}>\stackrel{+}{\mathrm{C}} \mathrm{H}_3$

B

$\left(\mathrm{CH}_3\right)_3 \stackrel{+}{\mathrm{C}}>\left(\mathrm{CH}_3\right)_2 \stackrel{+}{\mathrm{C}} \mathrm{H}>\mathrm{CH}_3-\stackrel{+}{\mathrm{C}} \mathrm{H}_2>\stackrel{+}{\mathrm{C}} \mathrm{H}_3$

C

D

$\stackrel{+}{\mathrm{C}} \mathrm{H}_3>\left(\mathrm{CH}_3\right)_2 \stackrel{+}{\mathrm{C}} \mathrm{H}>\mathrm{CH}_3-\stackrel{+}{\mathrm{C}} \mathrm{H}_2>\left(\mathrm{CH}_3\right)_3 \stackrel{+}{\mathrm{C}}$

Question 87: Palette 87/260

JEE Mains 2024 MCQ

Which among the following purification methods is based on the principle of "Solubility" in two different solvents?

A

Distillation

B

Sublimation

C

Column Chromatography

D

Differential Extraction

Question 88: Palette 88/260

JEE Mains 2024 MCQ

IUPAC name of following compound is :

A

2-Aminobutanenitrile

B

3-Aminopropanenitrile

C

2-Aminopentanenitrile

D

3-Aminobutanenitrile

Question 89: Palette 89/260

JEE Mains 2024 MCQ

Which of the following molecule/species is most stable?

A

B

C

D

Question 90: Palette 90/260

JEE Mains 2024 MCQ

According to IUPAC system, the compound

is named as

A

Cyclohex-2-en-1-ol

B

1-Hydroxyhex-2-ene

C

Cyclohex-1-en-3-ol

D

Cyclohex-1-en-2-ol

Question 91: Palette 91/260

JEE Mains 2024 MCQ

The ascending acidity order of the following H atoms is

A

A < B < D < C

B

A < B < C < D

C

D < C < B < A

D

C < D < B < A

Question 92: Palette 92/260

JEE Mains 2024 MCQ

Which one of the following will show geometrical isomerism?

A

B

C

D

Question 93: Palette 93/260

JEE Mains 2024 MCQ

The interaction between $\pi$ bond and lone pair of electrons present on an adjacent atom is responsible for

A

Resonance effect

B

Electromeric effect

C

Hyperconjugation

D

Inductive effect

Question 94: Palette 94/260

JEE Mains 2024 MCQ

The order of relative stability of the contributing structure is :

Choose the correct answer from the options given below :

A

I = II = III

B

I > II > III

C

III > II > I

D

II > I > III

Question 95: Palette 95/260

JEE Mains 2024 MCQ

The incorrect statement regarding conformations of ethane is :

A

The dihedral angle in staggered conformation is $60^{\circ}$.

B

Ethane has infinite number of conformations.

C

Eclipsed conformation is the most stable conformation.

D

The conformations of ethane are inter-convertible to one-another.

Question 96: Palette 96/260

JEE Mains 2024 MCQ

Bond line formula of HOCH(CN)$_2$ is :

A

B

C

D

Question 97: Palette 97/260

JEE Mains 2024 MCQ

Which of the following is strongest Bronsted base?

A

B

C

D

Question 98: Palette 98/260

JEE Mains 2024 MCQ

Which of the following has highly acidic hydrogen?

A

B

C

D

Question 99: Palette 99/260

JEE Mains 2024 MCQ

Cyclohexene

is ________ type of an organic compound.

A

Benzenoid aromatic

B

Benzenoid non-aromatic

C

Acyclic

D

Alicyclic

Question 100: Palette 100/260

JEE Mains 2024 MCQ

IUPAC name of following compound (P) is:

A

l-Ethyl-5, 5-dimethylcyclohexane

B

3-Ethyl-1,1-dimethylcyclohexane

C

l-Ethyl-3, 3-dimethylcyclohexane

D

1,1-Dimethyl-3-ethylcyclohexane

Question 101: Palette 101/260

JEE Mains 2023 MCQ

Which of the following statement is correct for paper chromatography?

A

Water present in the mobile phase gets absorbed by the paper which then forms the stationary phase.

B

Water present in the pores of the paper forms the stationary phase.

C

Paper sheet forms the stationary phase.

D

Paper and water present in its pores together form the stationary phase.

Question 102: Palette 102/260

JEE Mains 2023 MCQ

Given below are two statements :

Statement I : Tropolone is an aromatic compound and has $8 \pi$ electrons.

Statement II : $\pi$ electrons of $ > \mathrm{C}=\mathrm{O}$ group in tropolone is involved in aromaticity.

In the light of the above statements, choose the correct answer from the options given below:

A

Statement I is false but Statement II is true

B

Both Statement I and Statement II are false

C

Statement I is true but Statement II is false

D

Both Statement I and Statement II are true

Question 103: Palette 103/260

JEE Mains 2023 MCQ

Among the following compounds, the one which shows highest dipole moment is

A

B

C

D

Question 104: Palette 104/260

JEE Mains 2023 MCQ

Thin layer chromatography of a mixture shows the following observation:

The correct order of elution in the silica gel column chromatography is

A

B, A, C

B

C, A, B

C

A, C, B

D

B, C, A

Question 105: Palette 105/260

JEE Mains 2023 MCQ

The decreasing order of hydride affinity for following carbocations is:

Choose the correct answer from the options given below:

A

A, C, D, B

B

C, A, B, D

C

A, C, B, D

D

C, A, D, B

Question 106: Palette 106/260

JEE Mains 2023 MCQ

Using column chromatography, mixture of two compounds 'A' and 'B' was separated. 'A' eluted first, this indicates 'B' has

A

high R_f, weaker adsorption

B

high R_f, stronger adsorption

C

low R_f, weaker adsorption

D

low R_f, stronger adsorption

Question 107: Palette 107/260

JEE Mains 2023 MCQ

The correct IUPAC nomenclature for the following compound is:

A

2 - Formyl -5-methylhexan-6-oic acid

B

5-Methyl-2-oxohexan-6-oic acid

C

5-Formyl -2-methylhexanoic acid

D

2-Methyl-5-oxohexanoic acid

Question 108: Palette 108/260

JEE Mains 2023 MCQ

The descending order of acidity for the following carboxylic acid is-

A. $\mathrm{CH}_{3} \mathrm{COOH}$

B. $\mathrm{F}_{3} \mathrm{C}-\mathrm{COOH}$

C. $\mathrm{ClCH}_{2}-\mathrm{COOH}$

D. $\mathrm{FCH}_{2}-\mathrm{COOH}$

E. $\mathrm{BrCH}_{2}-\mathrm{COOH}$

Choose the correct answer from the options given below:

A

B > C > D > E > A

B

D > B > A > E > C

C

B > D > C > E > A

D

E > D > B > A > C

Question 109: Palette 109/260

JEE Mains 2023 MCQ

From the figure of column chromatography given below, identify incorrect statements.

A. Compound 'c' is more polar than 'a' and 'b'

B. Compound '$\mathrm{a}$' is least polar

C. Compound 'b' comes out of the column before 'c' and after 'a'

D. Compound 'a' spends more time in the column

Choose the correct answer from the options given below:

A

B and D only

B

B, C and D only

C

A, B and D only

D

A, B and C only

Question 110: Palette 110/260

JEE Mains 2023 MCQ

Resonance in carbonate ion $\left(\mathrm{CO}_{3}{ }^{2-}\right)$ is

Which of the following is true?

A

It is possible to identify each structure individually by some physical or chemical method.

B

All these structures are in dynamic equilibrium with each other.

C

Each structure exists for equal amount of time.

D

$\mathrm{CO}_{3}{ }^{2-}$ has a single structure i.e., resonance hybrid of the above three structures.

Question 111: Palette 111/260

JEE Mains 2023 MCQ

Match items of column I and II

	Column I (Mixture of compounds)		Column II (Separation Technique)
A.	$\mathrm{H_2O/CH_2Cl_2}$	i.	Crystalization
B.		ii.	Differential solvent extraction
C.	Kerosene / Naphthalene	iii.	Column chromatography
D.	$\mathrm{C_6H_{12}O_6/NaCl}$	iv.	Fractional Distillation

Correct match is

A

A-(ii), B-(iv), C-(i), D-(iii)

B

A-(iii), B-(iv), C-(ii), D-(i)

C

A-(i), B-(iii), C-(ii), D-(iv)

D

A-(ii), B-(iii), C-(iv), D-(i)

Question 112: Palette 112/260

JEE Mains 2023 MCQ

Match List I with List II:

List I (Mixture)		List II (Separation Technique)
A.	$\mathrm{CHCl}_3+\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2$	I.	Steam distillation
B.	$\mathrm{C}_6 \mathrm{H}_{14}+\mathrm{C}_5 \mathrm{H}_{12}$	II.	Differential extraction
C.	$\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2+\mathrm{H}_2 \mathrm{O}$	III.	Distillation
D.	$\text { Organic compound in } \mathrm{H}_2 \mathrm{O}$	IV.	Fractional distillation

A

A-III, B-I, C-IV, D-II

B

A-II, B-I, C-III, D-IV

C

A-IV, B-I, C-III, D-II

D

A-III, B-IV, C-I, D-II

Question 113: Palette 113/260

JEE Mains 2023 MCQ

Which of the following conformations will be the most stable?

A

B

C

D

Question 114: Palette 114/260

JEE Mains 2023 MCQ

The correct order in aqueous medium of basic strength in case of methyl substituted amines is :

A

$\mathrm{NH_3 > Me_3N > MeNH_2 > Me_2NH}$

B

$\mathrm{Me_3N > Me_2NH > MeNH_2 > NH_3}$

C

$\mathrm{Me_2NH > MeNH_2 > Me_3N > NH_3}$

D

$\mathrm{Me_2NH > Me_3N > MeNH_2 > NH_3}$

Question 115: Palette 115/260

JEE Mains 2023 MCQ

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion A : Benzene is more stable than hypothetical cyclohexatriene

Reason R : The delocalised $\pi$ electron cloud is attracted more strongly by nuclei of carbon atoms.

In the light of the above statements, choose the correct answer from the options given below:

A

A is true but R is false

B

Both A and R are correct and R is the correct explanation of A

C

Both A and R are correct but R is NOT the correct explanation of A

D

A is false but R is true

Question 116: Palette 116/260

JEE Mains 2023 MCQ

Which will undergo deprotonation most readily in the basic medium?

A

a only

B

Both a and c

C

c only

D

b only

Question 117: Palette 117/260

JEE Mains 2022 MCQ

Given below are two statements.

Statement I : The compound is optically active.

Statement II : is mirror image of above compound A.

In the light of the above statement, choose the most appropriate answer from the options given below.

A

Both Statement I and Statement II are correct.

B

Both Statement I and Statement II are incorrect.

C

Statement I is correct but Statement II is incorrect.

D

Statement I is incorrect but Statement II is correct.

Question 118: Palette 118/260

JEE Mains 2022 MCQ

Arrange the following in increasing order of reactivity towards nitration

A. p-xylene

B. bromobenzene

C. mesitylene

D. nitrobenzene

E. benzene

Choose the correct answer from the options given below

A

C < D < E < A < B

B

D < B < E < A < C

C

D < C < E < A < B

D

C < D < E < B < A

Question 119: Palette 119/260

JEE Mains 2022 MCQ

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R

Assertion A : Thin layer chromatography is an adsorption chromatography.

Reason R : A thin layer of silica gel is spread over a glass plate of suitable size in thin layer chromatography which acts as an adsorbent.

In the light of the above statements, choose the correct answer from the options given below

A

Both A and R are true and R is the correct explanation of A

B

Both A and R are true but R is NOT the correct explanation of A

C

A is true but R is false

D

A is false but R is true

Question 120: Palette 120/260

JEE Mains 2022 MCQ

Match List - I with List - II.

	List - I		List - II
(A)		(I)	Spiro compound
(B)		(II)	Aromatic compound
(C)		(III)	Non-planar Heterocyclic compound
(D)		(IV)	Bicyclo compound

Choose the correct answer from the options given below :

A

(A) - (II), (B) - (I), (C) - (IV), (D) - (III)

B

(A) - (IV), (B) - (III), (C) - (I), (D) - (II)

C

(A) - (III), (B) - (IV), (C) - (I), (D) - (II)

D

(A) - (IV), (B) - (III), (C) - (II), (D) - (I)

Question 121: Palette 121/260

JEE Mains 2022 MCQ

Among the following marked proton of which compound shows lowest $\mathrm{pK}_{\mathrm{a}}$ value?

A

B

C

D

Question 122: Palette 122/260

JEE Mains 2022 MCQ

Match List - I with List - II.

	List - I (Mixture)		List - II (Purification Process)
(A)	Chloroform & Aniline	(I)	Steam distillation
(B)	Benzoic acid & Napthalene	(II)	Sublimation
(C)	Water & Aniline	(III)	Distillation
(D)	Napthalene & Sodium chloride	(IV)	Crystallisation

Choose the correct answer from the options given below :

A

(A) - (IV), (B) - (III), (C) - (I), (D) - (II)

B

(A) - (III), (B) - (I), (C) - (IV), (D) - (II)

C

(A) - (III), (B) - (IV), (C) - (II), (D) - (I)

D

(A) - (III), (B) - (IV), (C) - (I), (D) - (II)

Question 123: Palette 123/260

JEE Mains 2022 MCQ

Given below are two statements: one is labelled as Assertion A and, the other is labelled as Reason R.

Assertion A: [6] Annulene, [8] Annulene and cis-[10] Annulene, are respectively aromatic, not-aromatic and aromatic.

Reason R: Planarity is one of the requirements of aromatic systems.

In the light of the above statements, choose the most appropriate answer from the options given below.

A

Both A and R are correct and R is the correct explanation of A.

B

Both A and R are correct but R is NOT the correct explanation of A.

C

A is correct but R is not correct.

D

A is not correct but R is correct.

Question 124: Palette 124/260

JEE Mains 2022 MCQ

The correct decreasing order of priority of functional groups in naming an organic Question: compound as per IUPAC system of nomenclature is

A

$-\mathrm{COOH}>-\mathrm{CONH}_{2}>-\mathrm{COCl}>-\mathrm{CHO}$

B

$\mathrm{SO}_{3} \mathrm{H}>-\mathrm{COCl}>-\mathrm{CONH}_{2}>-\mathrm{CN}$

C

D

$-\mathrm{COOH}>-\mathrm{COOR}>-\mathrm{CONH}_{2}>-\mathrm{COCl}$

Question 125: Palette 125/260

JEE Mains 2022 MCQ

Which technique among the following, is most appropriate in separation of a mixture of $100 \,\mathrm{mg}$ of $p$-nitrophenol and picric acid ?

A

Steam distillation

B

2-5 ft long column of silica gel

C

Sublimation

D

Preparative TLC (Thin Layer Chromatography)

Question 126: Palette 126/260

JEE Mains 2022 MCQ

Which of the following compounds is not aromatic?

A

B

C

D

Question 127: Palette 127/260

JEE Mains 2022 MCQ

Arrange the following in decreasing acidic strength.

A

A > B > C > D

B

B > A > C > D

C

D > C > A > B

D

D > C > B > A

Question 128: Palette 128/260

JEE Mains 2022 MCQ

Which of the following carbocations is most stable?

A

B

C

D

Question 129: Palette 129/260

JEE Mains 2022 MCQ

The correct IUPAC name of the following compound is :

A

4-methyl-2-nitro-5-oxohept-3-enal

B

4-methyl-5-oxo-2-nitrohept-3-enal

C

4-methyl-6-nitro-3-oxohept-4-enal

D

6-formyl-4-methyl-2-nitrohex-3-enal

Question 130: Palette 130/260

JEE Mains 2022 MCQ

Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate?

A

I₂ (Solid)

B

U.V. Light

C

Visualisation agent as a component of mobile phase

D

Spraying of an appropriate reagent

Question 131: Palette 131/260

JEE Mains 2022 MCQ

Which of the following structure are aromatic in nature?

A

A, B, C, and D

B

Only A and B

C

Only A and C

D

Only B, C and D

Question 132: Palette 132/260

JEE Mains 2022 MCQ

Which of the following is most stable?

A

B

C

D

Question 133: Palette 133/260

JEE Mains 2022 MCQ

The correct order of nucleophilicity is

A

F^$-$ > OH^$-$

B

C

D

NH$_2^ - $ > NH₃

Question 134: Palette 134/260

JEE Mains 2022 MCQ

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : A mixture contains benzoic acid and napthalene. The pure benzoic acid can be separated out by the use of benzene.

Reason R : Benzoic acid is soluble in hot water.

In the light of the above statements, choose the most appropriate answer from the options given below.

A

Both A and R are true and R is the correct explanation of A.

B

Both A and R are true but R is NOT the correct explanation of A.

C

A is true but R is false.

D

A is false but R is true.

Question 135: Palette 135/260

JEE Mains 2022 MCQ

Phenol on reaction with dilute nitric acid, gives two products. Which method will be most efficient for large scale separation?

A

Chromatographic separation

B

Fractional Crystallisation

C

Steam distillation

D

Sublimation

Question 136: Palette 136/260

JEE Mains 2022 MCQ

In the following structures, which on is having staggered conformation with maximum dihedral angle?

A

B

C

D

Question 137: Palette 137/260

JEE Mains 2022 MCQ

The IUPAC name of ethylidene chloride is :

A

1-Chloroethene

B

1-Chloroethyne

C

1,2-Dichloroethane

D

1,1-Dichloroethane

Question 138: Palette 138/260

JEE Mains 2022 MCQ

Arrange the following carbocations in decreasing order of stability.

A

B > A > C

B

A > B > C

C

C > B > A

D

C > A > B

Question 139: Palette 139/260

JEE Mains 2022 MCQ

Which of the following is an example of conjugated diketone?

A

B

C

D

Question 140: Palette 140/260

JEE Mains 2022 MSQ

Which of the following is not an example of benzenoid compound?

A

B

C

D

Question 141: Palette 141/260

JEE Mains 2021 MCQ

Arrange the following conformational isomers of n-butane in order of their increasing potential energy :

A

II < III < IV < I

B

I < IV < III < II

C

II < IV < III < I

D

I < III < IV < II

Question 142: Palette 142/260

JEE Mains 2021 MCQ

Choose the correct name for compound given below :

A

(4E)-5-Bromo-hex-4-en-2-yne

B

(2E)-2-Bromo-hex-4-yn-2-ene

C

(2E)-2-Bromo-hex-2-en-4-yne

D

(4E)-5-Bromo-hex-2-en-4-yne

Question 143: Palette 143/260

JEE Mains 2021 MCQ

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R) :

Assertion (A) : A simple distillation can be used to separate a mixture of propanol and propanone.

Reason (R) : Two liquids with a difference of more than 20$^\circ$ in their boiling points can be separated by simple distillations.

In the light of the above statements, choose the most appropriate answer from the options given below :

A

(A) is false but (R) is true.

B

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are correct and (R) is the correct explanation of (A).

Question 144: Palette 144/260

JEE Mains 2021 MCQ

The compound/s which will show significant intermolecular H-bonding is/are :

A

(b) only

B

(c) only

C

(a) and (b) only

D

(a), (b) and (c)

Question 145: Palette 145/260

JEE Mains 2021 MCQ

Which one of the following compounds is not aromatic?

A

B

C

D

Question 146: Palette 146/260

JEE Mains 2021 MCQ

The number of stereoisomers possible for 1, 2-dimethyl cyclopropane is :

A

One

B

Four

C

Two

D

Three

Question 147: Palette 147/260

JEE Mains 2021 MCQ

Given below are two statements :

Statement I : Hyperconjugation is a permanent effect.

Statement II : Hyperconjugation in ethyl cation $\left( {C{H_3} - \mathop C\limits^ + {H_2}} \right)$ involves the overlapping of ${C_{s{p^2}}} - {H_{1s}}$ bond with empty 2p orbital of other carbon.

Choose the correct option :

A

Both statement I and statement II are false

B

Statement I is incorrect but statement II is true

C

Statement I is correct but statement II is false

D

Both statement I and statement II are true.

Question 148: Palette 148/260

JEE Mains 2021 MCQ

Staggered and eclipsed conformers of ethane are :

A

Polymers

B

Rotamers

C

Enantiomers

D

Mirror images

Question 149: Palette 149/260

JEE Mains 2021 MCQ

The correct order of stability of given carbocation is :

A

A > C > B > D

B

D > B > C > A

C

D > B > A > C

D

C > A > D > B

Question 150: Palette 150/260

JEE Mains 2021 MCQ

The correct decreasing order of densities of the following compounds is :

A

(D) > (C) > (B) > (A)

B

(C) > (D) > (A) > (B)

C

(C) > (B) > (A) > (D)

D

(A) > (B) > (C) > (D)

Question 151: Palette 151/260

JEE Mains 2021 MCQ

Which among the following is the strongest acid ?

A

$C{H_3}C{H_2}C{H_2}C{H_3}$

B

C

D

Question 152: Palette 152/260

JEE Mains 2021 MCQ

Which one among the following resonating structures is not correct?

A

B

C

D

Question 153: Palette 153/260

JEE Mains 2021 MCQ

Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point)?

A

Simple distillation

B

Steam ditillation

C

Fractional distillation

D

Reduced pressure distillation

Question 154: Palette 154/260

JEE Mains 2021 MCQ

Which of the following compounds does not exhibit resonance?

A

CH₃CH₂OCH = CH₂

B

C

CH₃CH₂CH₂CONH₂

D

CH₃CH₂CH = CHCH₂NH₂

Question 155: Palette 155/260

JEE Mains 2021 MCQ

Which of the following molecules does not show stereo isomerism?

A

3, 4-Dimethylhex-3-ene

B

3-Methylhex-1-ene

C

3-Ethylhex-3-ene

D

4-Methylhex-1-ene

Question 156: Palette 156/260

JEE Mains 2021 MCQ

Which one of the following pairs of isomers is an example of metamerism?

A

B

C

D

Question 157: Palette 157/260

JEE Mains 2021 MCQ

Among the given species the Resonance stabilised carbocations are :

A

(C) and (D) only

B

(A), (B) and (D) only

C

(A) and (B) only

D

(A), (B) and (C) only

Question 158: Palette 158/260

JEE Mains 2021 MCQ

In the following molecule,


Hybridisation of Carbon a, b, and c respectively are :

A

sp³, sp², sp²

B

sp³, sp, sp²

C

sp³, sp², sp

D

sp³, sp, sp

Question 159: Palette 159/260

JEE Mains 2021 MCQ

Compound with molecular formula C₃H₆O can show :

A

Positional isomerism

B

Both positional isomerism and metamerism

C

Metamerism

D

Functional group isomerism

Question 160: Palette 160/260

JEE Mains 2021 MCQ

Nitrogen can be estimated by Kjeldahl's method for which of the following compound?

A

B

C

D

Question 161: Palette 161/260

JEE Mains 2021 MCQ

Which of the following is an aromatic compound?

A

B

C

D

Question 162: Palette 162/260

JEE Mains 2021 MCQ

Given below are two statements :

Statement I : Retardation factor (R_f) can be measured in meter/centimeter.

Statement II : R_f value of a compound remains constant in all solvents.

Choose the most appropriate answer from the options given below :

A

Statement I is true but statement II is false

B

Statement I is false but statement II is true

C

Both statement I and statement II are true

D

Both statement I and statement II are false

Question 163: Palette 163/260

JEE Mains 2021 MCQ

In chromotography technique, the purification of compound is independent of :

A

Solubility of the compound

B

Mobility or flow of solvent system

C

Physical state of the pure compound

D

Length of the column or TLC plate

Question 164: Palette 164/260

JEE Mains 2021 MCQ

Among the following, the aromatic compounds are :


Choose the correct answer from the following options :

A

(B), (C) and (D) only

B

(B) and (C) only

C

(A), (B) and (C) only

D

(A) and (B) only

Question 165: Palette 165/260

JEE Mains 2021 MCQ

Given below are two statements :

Statement I : A mixture of chloroform and aniline can be separated by simple distillation.

Statement II : When separating aniline from a mixture of aniline and water by steam distillation aniline boils below its boiling point.

In the light of the above statements, choose the most appropriate answer from the options given below :

A

Both Statement I and Statement II are true

B

Both Statement I and Statement II are false

C

Statement I is true but Statement II is false

D

Statement I is false but Statement II is true

Question 166: Palette 166/260

JEE Mains 2021 MCQ

The correct order of acid character of the following compounds is :

A

IV > III > II > I

B

III > II > I > IV

C

II > III > IV > I

D

I > II > III > IV

Question 167: Palette 167/260

JEE Mains 2021 MCQ

Which one of the following compounds is non-aromatic?

A

B

C

D

Question 168: Palette 168/260

JEE Mains 2021 MSQ

Which one of the following compounds is aromatic in nature?

A

B

C

D

Question 169: Palette 169/260

JEE Mains 2020 MCQ

The IUPAC name of the following compound is :

A

2-nitro-4-hydroxymethyl-5-amino benzaldehyde

B

3-amino-4-hydroxymethyl-5-nitro benzaldehyde

C

4-amino-2-formyl-5-hydroxymehtyl nitrobenzene

D

5-amino-4-hydroxymethyl-2-nitro benzaldehyde

Question 170: Palette 170/260

JEE Mains 2020 MCQ

Which of the following compounds shows geometrical isomerism?

A

2-methylpent-1-ene

B

4-methylpent-1-ene

C

2-methylpent-2-ene

D

4-methylpent-2-ene

Question 171: Palette 171/260

JEE Mains 2020 MCQ

The increasing order of boiling points of the following compounds is :

A

I < III < IV < II

B

IV < I < II < III

C

I < IV < III < II

D

III < I < II < IV

Question 172: Palette 172/260

JEE Mains 2020 MCQ

The IUPAC name of the following compound is :

A

3-Bromo-5-methylcyclopentane carboxylic acid

B

3-Bromo-5-methylcyclopentanoic acid

C

4-Bromo-2-methylcyclopentane carboxylic acid

D

5-Bromo-3-methylcyclopentanoic acid

Question 173: Palette 173/260

JEE Mains 2020 MCQ

Which one of the following compounds possesses the most acidic hydrogen?

A

H₃C - C $ \equiv $ C - H

B

C

D

Question 174: Palette 174/260

JEE Mains 2020 MCQ

Glycerol is separated in soap industries by :

A

Fractional distillation

B

Distillation under reduced pressure

C

Differential extraction

D

Steam distillation

Question 175: Palette 175/260

JEE Mains 2020 MCQ

The IUPAC name for the following compound is

A

2, 5-dimethyl-6-carboxy-hex-3-enal

B

6-formyl-2-methyl-hex-3-enoic acid

C

2, 5-dimethyl-5-carboxy-hex-3-enal

D

2, 5-dimethyl-6-oxo-hex-3-enoic acid

Question 176: Palette 176/260

JEE Mains 2020 MCQ

Which of the following has the shortest C-Cl bond?

A

Cl–CH=CH–CH₃

B

Cl–CH=CH–NO₂

C

Cl–CH=CH–OCH₃

D

Cl–CH=CH₂

Question 177: Palette 177/260

JEE Mains 2020 MCQ

The increasing order of basicity for the following intermediates is (from weak to strong)

A

(iii) < (i) < (ii) < (iv) < (v)

B

(iii) < (iv) < (ii) < (i) < (v)

C

(v) < (i) < (iv) < (ii) < (iii)

D

(v) < (iii) < (ii) < (iv) < (i)

Question 178: Palette 178/260

JEE Mains 2020 MCQ

Kjeldahl's method cannot be used to estimate nitrogen for which of the following compounds?

A

C₆H₅NH₂

B

${\rm{N}}{{\rm{H}}_2} - \mathop C\limits^{\mathop \parallel \limits^O } - {\rm{N}}{{\rm{H}}_2}$

C

C₆H₅NO₂

D

CH₃CH₂-C $ \equiv $ N

Question 179: Palette 179/260

JEE Mains 2020 MCQ

A flask contains a mixture of isohexane and 3-methylpentane. One of the liquids boils at 63^oC while the other boils at 60^oC What is the best way to separate the two liquids and which one will be distilled out first ?

A

fractional distillation, 3-methylpentane

B

simple distillation, 3-methylpentane

C

fractional distillation, isohexane

D

simple distillation, isohexane

Question 180: Palette 180/260

JEE Mains 2020 MCQ

A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of (A) benzanilide (B) aniline and (C) acetophenone. When the column is eluted with a mixture of solvents, hexane : ethylacelate (20:80), the sequence of obtained compounds is :

A

(A), (B) and (C)

B

(B), (A) and (C)

C

(C), (A) and (B)

D

(B), (C) and (A)

Question 181: Palette 181/260

JEE Mains 2020 MCQ

The increasing order to P_kb for the following compounds will be :

A

(A) < (B) < (C)

B

(C) < (A) < (B)

C

(B) < (A) < (C)

D

(B) < (C) < (A)

Question 182: Palette 182/260

JEE Mains 2020 MSQ

Among the following compounds, geometrical isomerism is exhibited by :

A

B

C

D

Question 183: Palette 183/260

JEE Mains 2019 MCQ

The IUPAC name for the following compound is :

A

3, 5-dimethyl-4-propylhept-1-en-6-yne

B

3-methyl-4-(3-methylprop-1-enyl)-1-heptyne

C

3-methyl-4-(1-methylprop-2-enyl)-1-heptene

D

3,5-dimethyl-4-propylhept-6-en-1-yne

Question 184: Palette 184/260

JEE Mains 2019 MCQ

The increasing order of the pK_b of the following compound is :

A

(C) < (A) < (D) < (B)

B

(B) < (D) < (C) < (A)

C

(B) < (D) < (A) < (C)

D

(A) < (C) < (D) < (B)

Question 185: Palette 185/260

JEE Mains 2019 MCQ

In chromatography, which of the following statements is incorrect for R_f ?

A

R_f value depends on the type of chromatography.

B

Higher R_f value means higher adsorption.

C

R_f value is dependent on the mobile phase.

D

The value of R_f can not be more than one.

Question 186: Palette 186/260

JEE Mains 2019 MCQ

Which of these factors does not govern the stability of a conformation in acyclic compounds?

A

Angle strain

B

Torsional strain

C

Electrostatic forces of interaction

D

Steric interactions

Question 187: Palette 187/260

JEE Mains 2019 MCQ

The increasing order of nucleophilicity of the following nucleophiles is :
(a) CH₃CO₂^$-$           (b) H₂O
(c) CH₃SO₃^$-$           (d) $\mathop O\limits^ - H$

A

(b) < (c) < (a) < (d)

B

(b) < (c) < (d) < (a)

C

(a) < (d) < (c) < (b)

D

(d) < (a) < (c) < (b)

Question 188: Palette 188/260

JEE Mains 2019 MCQ

The principle of column chromatography is :

A

Gravitational force.

B

Capillary action.

C

Differential adsorption of the substances on the solid phase.

D

Differential absorption of the substances on the solid phase.

Question 189: Palette 189/260

JEE Mains 2019 MCQ

The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reactions is :

A

III < II < I

B

III < I < II

C

II < I < III

D

I < III < II

Question 190: Palette 190/260

JEE Mains 2019 MCQ

The correct IUPAC name of the following compound is :

A

2-methyl-5-nitro-1-chlorobenzene

B

2-chloro-1-methyl-4-nitrobenzene

C

3-chloro-4-methyl-1-nitrobenzene

D

5-chloro-4-methyl-1-nitrobenzene

Question 191: Palette 191/260

JEE Mains 2019 MCQ

The increasing order of reactivity of the following compounds towards aromatic electrophilic substitution reaction is :

A

A < B < C < D

B

D < A < C < B

C

D < B < A < C

D

B < C < A < D

Question 192: Palette 192/260

JEE Mains 2019 MCQ

Which of the following compounds will show the maximum 'enol' content?

A

CH₃COCH₃

B

CH₃COCH₂COCH₃

C

CH₃COCH₂COOC₂H₅

D

CH₃COCH₂CONH₂

Question 193: Palette 193/260

JEE Mains 2019 MCQ

The IUPAC name of the following compound is :

A

3-Hydroxy-4-methylpentanoic acid

B

4,4-Dimethyl-3-hydroxybutanoic acid

C

2-Methyl-3-hydroxypentan-5-oic acid

D

4-Methyl-3-hydroxypentanoic acid

Question 194: Palette 194/260

JEE Mains 2019 MCQ

In the following compounds, the decreasing order of basic strength will be :

A

(C₂H₅)₂NH > NH₃ > C₂H₅NH₂

B

NH₃ > C₂H₅NH₂ > (C₂H₅)₂NH

C

(C₂H₅)₂NH > C₂H₅NH₂ > NH₃

D

C₂H₅NH₂ > NH₃ > (C₂H₅)₂NH

Question 195: Palette 195/260

JEE Mains 2019 MCQ

Among the following four aromatic compounds, which one will have the lowest melting point ?

A

B

C

D

Question 196: Palette 196/260

JEE Mains 2019 MCQ

In the following compound,



the favourable site/s for protonation is/are :

A

(b), (c) and (d)

B

(a) and (e)

C

(a) and (d)

D

(a)

Question 197: Palette 197/260

JEE Mains 2019 MCQ

The correct match between items I and II is :

Item-I (Mixture)		Item-II (Seperation method)
(A)	H2O : Sugar	(P)	Sublimation
(B)	H2O : Aniline	(Q)	Recrystallization
(C)	H2O : Toluene	(R)	Steam distillation
		(S)	Differential extraction

A

A$ \to $(R); (B)$ \to $(P); (C)$ \to $(S)

B

A$ \to $(Q); (B)$ \to $(R); (C)$ \to $(S)

C

A$ \to $(Q); (B)$ \to $(P); (C)$ \to $(R)

D

A$ \to $(S); (B)$ \to $(R); (C)$ \to $(P)

Question 198: Palette 198/260

JEE Mains 2019 MCQ

What is the IUPAC name of the following compound ?

A

4–Bromo-3-methylpent-2-ene

B

3–Bromo 1, 2-dimethylbut-1-ene

C

3–Bromo-3-methyl-1, 2-dimethylprop-1-ene

D

2-Bromo-3-methylpent-3-ene

Question 199: Palette 199/260

JEE Mains 2019 MCQ

If dichloromethane (DCM) and water (H₂O) are used for differential extraction, which one of the following statements is correct ?

A

DCM and H₂O would stay as upper and lower layer respectively in the separating funnel (S.F.)

B

DCM and H₂O will make turbid/colloidal mixture

C

DCM and H₂O would stay as lower and upper layer respectively in the separating funnel(S.F).

D

DCM and H₂O will be miscible clearly

Question 200: Palette 200/260

JEE Mains 2019 MCQ

The increasing basicity order of the following compounds is :

A

A < B < D < C

B

D < C < A < B

C

D < C < B < A

D

A < B < C < D

Question 201: Palette 201/260

JEE Mains 2019 MCQ

Which of the following compounds is not aromatic ?

A

B

C

D

Question 202: Palette 202/260

JEE Mains 2019 MCQ

The correct decreasing order for acid strength is :

A

NO₂CH₂COOH > FCH₂COOH > CNCH₂COOH > ClCH₂COOH

B

FCH₂COOH > NCCH₂COOH > NO₂CH₂COOH > ClCH₂COOH

C

CNCH₂COOH > O₂NCH₂COOH > FCH₂COOH > ClCH₂COOH

D

NO₂CH₂COOH > NCCH₂COOH > FCH₂COOH > ClCH₂COOH

Question 203: Palette 203/260

JEE Mains 2019 MCQ

Which amongst the following is the strongest acid ?

A

CHBr₃

B

CHI₃

C

CH(CN)₃

D

CHCl₃

Question 204: Palette 204/260

JEE Mains 2018 MCQ

On treatment of the following compound with a strong acid, the most susceptible site for bond cleavage is :

A

Cl $-$ O2

B

O2 $-$ C3

C

C4 $-$ O5

D

O5 $-$ C6

Question 205: Palette 205/260

JEE Mains 2018 MCQ

Two compounds I and II are eluted by column chromatography (adsorption of I > II). Which one of following is a correct statement ?

A

I moves faster and has higher R_f value than II

B

II movesfaster and has higher  R_f  value than I

C

I moves slower and has higher  R_f  value than II

D

II moves slower and has higher  R_f  value than I

Question 206: Palette 206/260

JEE Mains 2018 MCQ

The correct match between items of List-I and List-II is :

List - I		List - II
(A)	Coloured impurity	(P)	Steam distilation
(B)	Mixture of o-nitrophenol and p-nitrophenol	(Q)	Fractional distilation
(C)	Crude Naphtha	(R)	Charcoal treatment
(d)	Mixture of glycerol and sugars	(S)	Distillation under reduced pressure

A

(A)-(R), (B)-(S), (C)-(P), (D)-(Q)

B

(A)-(R), (B)-(P), (C)-(S), (D)-(Q)

C

(A)-(R), (B)-(P), (C)-(Q), (D)-(S)

D

(A)-(P), (B)-(S), (C)-(R), (D)-(Q)

Question 207: Palette 207/260

JEE Mains 2018 MCQ

The IUPAC name of the following compound is :

A

4-methyl-3-ethylhex-4-ene

B

3-ethyl-4-methylhex-4-ene

C

4-ethyl-3-methylhex-2-ene

D

4, 4- diethyl-3-methylbut-2-ene

Question 208: Palette 208/260

JEE Mains 2017 MCQ

In the following structure, the double bonds are marked as I, II, III and IV



Geometrical isomerism is not possible at site (s) :

A

III

B

I

C

I and III

D

III and IV

Question 209: Palette 209/260

JEE Mains 2017 MCQ

Which of the following compounds will show highest dipole moment ?

A

(I)

B

(II)

C

(III)

D

(IV)

Question 210: Palette 210/260

JEE Mains 2017 MCQ

Which of the following compounds is most reactive to an aqueous solution of sodium carbonate ?

A

B

C

D

Question 211: Palette 211/260

JEE Mains 2017 MCQ

The IUPAC name of the following compound is :

A

1, 1-Dimethyl-2-ethylcylohexane

B

2-Ethyl-1, 1-dimethylcyclohexane

C

1-Ethyl-2,2-dimethylcyclohexane

D

2, 2-Dimethyl-1-ethylcycohexane

Question 212: Palette 212/260

JEE Mains 2017 MCQ

A mixture containing the following four compounds is extracted with $1M$ $HCl.$ The compound that goes to aqueous layer is :

A

(I)

B

(II)

C

(III)

D

(IV)

Question 213: Palette 213/260

JEE Mains 2017 MCQ

Which of the following statements is not true about partition chromatography?

A

Mobile phase can be a gas

B

Stationary phase is a finely divided solid adsorbent

C

Separation depends upon equilibration of solute between a mobile and a stationary phase

D

Paper chromatography is an example of partition chromatography

Question 214: Palette 214/260

JEE Mains 2017 MCQ

Which of the following molecules is least resonance stabilized?

A

B

C

D

Question 215: Palette 215/260

JEE Mains 2016 MCQ

The hydrocarbon with seven carbon atoms containing a neopentyl and a vinyl group is :

A

2, 2-dimethyl-4-pentene

B

Isopropyl-2-butene

C

4, 4-dimethylpentene

D

2, 2-dimethyl-3-pentene

Question 216: Palette 216/260

JEE Mains 2016 MCQ

The absolute configuration of



is :

A

$(2S, 3S)$

B

$(2R, 3R)$

C

$(2R, 3S)$

D

$(2S, 3R)$

Question 217: Palette 217/260

JEE Mains 2016 MCQ

The distillation technique most suited for separating glycerol from spent-lye in the soap industry is :

A

Simple distillation

B

Fractional distillation

C

Steam distillation

D

Distillation under reduced pressure

Question 218: Palette 218/260

JEE Mains 2015 MCQ

Which of the following compounds will exhibit geometrical isomerism?

A

3-Phenyl-1-butene

B

2-Phenyl-1-butene

C

1,1-Diphenyl-1-propane

D

1-Phenyl-2-butene

Question 219: Palette 219/260

JEE Mains 2015 MCQ

In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of AgBr. The percentage of bromine in the compound is: (at. Mass Ag = 108; Br = 80)

A

48

B

60

C

36

D

24

Question 220: Palette 220/260

JEE Mains 2014 MCQ

For the estimation of nitrogen, 1.4 g of organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of M/10 sulphuric acid. The unreacted acid required 20 ml of M/10 sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is:

A

3%

B

5%

C

6%

D

10%

Question 221: Palette 221/260

JEE Mains 2013 MCQ

The order of stability of the following carbocations :

A

${\rm I}{\rm I}{\rm I} > {\rm I}{\rm I} > {\rm I}$

B

${\rm I}{\rm I} > {\rm I}{\rm I}{\rm I} > {\rm I}$

C

${\rm I} > {\rm I}{\rm I} > {\rm I}{\rm I}{\rm I}$

D

${\rm I}{\rm I}{\rm I} > {\rm I} > {\rm I}{\rm I}$

Question 222: Palette 222/260

JEE Mains 2011 MCQ

Identify the compound that exhibits tautomerism.

A

Lactic acid

B

2-Pentanone

C

Pheno

D

2- Butene

Question 223: Palette 223/260

JEE Mains 2010 MCQ

Out of the following, the alkene that exhibits optical isomerism is

A

3–methyl–2–pentene

B

4–methyl–1–pentene

C

3–methyl–1–pentene

D

2–methyl–2–pentene

Question 224: Palette 224/260

JEE Mains 2010 MCQ

The correct order of increasing basicity of the given conjugate bases (R = CH₃) is

A

$RCO\overline O$ < HC = $\overline C$ < $\overline R$ < $\overline NH_2$

B

$\overline R$ < HC = $\overline C$ < $RCO\overline O$ < $\overline NH_2$

C

$RCO\overline O$ < $\overline NH_2$ < HC = $\overline C$ < $\overline R$

D

$RCO\overline O$ < HC = $\overline C$ < $\overline NH_2$ < $\overline R$

Question 225: Palette 225/260

JEE Mains 2009 MCQ

The number of stereoisomers possible for a compound of the molecular formula CH₃ - CH = CH - CH(OH) - Me is :

A

2

B

4

C

6

D

3

Question 226: Palette 226/260

JEE Mains 2009 MCQ

The alkene that exhibits geometrical isomerism is :

A

propene

B

2-methyl propene

C

2-butene

D

2- methyl -2- butene

Question 227: Palette 227/260

JEE Mains 2009 MCQ

The IUPAC name of neopentane is

A

2-methylbutane

B

2, 2-dimethylpropane

C

2-methylpropane

D

2,2-dimethylbutane

Question 228: Palette 228/260

JEE Mains 2009 MCQ

Arrange the carbanions, ${(C{H_3})_3}\overline C $, $\overline C C{l_3}$ , ${(C{H_3})_2}\overline C H$, ${C_6}{H_5}\overline C H{}_2$ in order of their decreasing stability :

A

${(C{H_3})_2}\overline C H$ > $\overline C C{l_3}$ > ${C_6}{H_5}\overline C H{}_2$ > ${(C{H_3})_3}\overline C $

B

$\overline C C{l_3}$ > ${C_6}{H_5}\overline C H{}_2$ > ${(C{H_3})_2}\overline C H$ > ${(C{H_3})_3}\overline C $

C

${(C{H_3})_3}\overline C $ > ${(C{H_3})_2}\overline C H$ > ${C_6}{H_5}\overline C H{}_2$ > $\overline C C{l_3}$

D

${C_6}{H_5}\overline C H{}_2$ > $\overline C C{l_3}$ > ${(C{H_3})_3}\overline C $ > ${(C{H_3})_2}\overline C H$

Question 229: Palette 229/260

JEE Mains 2008 MCQ

The absolute configuration of

A

$S,S$

B

$R,R$

C

$R,S$

D

$S,R$

Question 230: Palette 230/260

JEE Mains 2008 MCQ

The electrophile, ${E^ \oplus }$ attacks the benzene ring to generate the intermediate $\sigma - $complex. Of the following, which $\sigma - $complex is lowest energy?

A

B

C

D

Question 231: Palette 231/260

JEE Mains 2008 MCQ

The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is

A

−COOH, −SO₃H, −CONH₂, −CHO

B

−SO₃H, −COOH, −CONH₂, −CHO

C

−CHO, −COOH, −SO₃H, −CONH₂

D

−CONH₂, −CHO, −SO₃H, −COOH

Question 232: Palette 232/260

JEE Mains 2007 MCQ

Presence of a nitro group in a benzene ring

A

activates the ring towards electrophilic substitution

B

renders the ring basic

C

deactivates the ring towards nucleophilic substitution

D

deactivates the ring towards electrophilic substitution

Question 233: Palette 233/260

JEE Mains 2007 MCQ

Which of the following molecules is expected to rotate the plane of plane - polarized light?

A

B

C

D

Question 234: Palette 234/260

JEE Mains 2007 MCQ

A

$3$ - enthyl - $4$ - $4$ - dimethylheptane

B

$1,1$ - diethyl - $2,2$ - dimethylpentane

C

$4, 4$ - dimethyl -$5,5$ - diethylpentane

D

$5,5$ - diethyl - $4,4$ - dimethylpentane.

Question 235: Palette 235/260

JEE Mains 2007 MCQ

Which one of the following conformation of cyclohexane is chiral?

A

Twist boat

B

Rigid

C

Chair

D

Boat

Question 236: Palette 236/260

JEE Mains 2006 MCQ

CH₃Br + Nu^- $\to$ CH₃ - Nu + Br^- The decreasing order of the rate of the above reaction with nucleophiles (Nu^–) A to D is
[Nu^– = (A) PhO^–, (B) AcO^–, (C) HO–, (D) CH₃O^–]

A

A > B > C > D

B

B > D > C > A

C

D > C > A > B

D

D > C > B > A

Question 237: Palette 237/260

JEE Mains 2006 MCQ

Increasing order of stability among the three main conformations (i.e. Eclipse, Anti, Gauche) of 2-fluoroethanol is

A

Eclipse, Gauche, Anti

B

Gauche, Eclipse, Anti

C

Eclipse, Anti, Gauche

D

Anti, Gauche, Eclipse

Question 238: Palette 238/260

JEE Mains 2006 MCQ

The increasing order of stability of the following free radicals is

A

${({C_6}{H_5})_2}\mathop C\limits^ \bullet H$ < ${({C_6}{H_5})_3}\mathop C\limits^ \bullet$ < ${(C{H_3})_3}\mathop C\limits^ \bullet $ < ${(C{H_3})_2}\mathop C\limits^ \bullet H$

B

${(C{H_3})_2}\mathop C\limits^ \bullet H$ < ${(C{H_3})_3}\mathop C\limits^ \bullet $ < ${({C_6}{H_5})_2}\mathop C\limits^ \bullet H$ < ${({C_6}{H_5})_3}\mathop C\limits^ \bullet$

C

${(C{H_3})_2}\mathop C\limits^ \bullet H$ < ${(C{H_3})_3}\mathop C\limits^ \bullet $ < ${({C_6}{H_5})_3}\mathop C\limits^ \bullet$ < ${({C_6}{H_5})_2}\mathop C\limits^ \bullet H$

D

${({C_6}{H_5})_3}\mathop C\limits^ \bullet$ < ${({C_6}{H_5})_2}\mathop C\limits^ \bullet H$ < ${(C{H_3})_3}\mathop C\limits^ \bullet $ < ${(C{H_3})_2}\mathop C\limits^ \bullet H$

Question 239: Palette 239/260

JEE Mains 2006 MCQ

The $IUPAC$ name of the compound shown below is :

A

$3$-bromo - $1$-chlorocyclohexene

B

$1$-bromo - $3$-chlorocyclohexene

C

$2$-bromo - $6$-chlorocyclohex - $1$ -ene

D

$6$-bromo - $2$ - chlorocyclohexene

Question 240: Palette 240/260

JEE Mains 2005 MCQ

The reaction



is fastest when $X$ is

A

$OCOR$

B

$O{C_2}{H_5}$

C

$N{H_2}$

D

$Cl$

Question 241: Palette 241/260

JEE Mains 2005 MCQ

The decreasing order of nucleophilicity among the nucleophiles

A

$\left( C \right),\left( B \right),\left( A \right),\left( D \right)$

B

$\left( B \right),\left( C \right),\left( A \right),\left( D \right)$

C

$\left( D \right),\left( C \right),\left( B \right),\left( A \right)$

D

$\left( A \right),\left( B \right),\left( C \right),\left( D \right)$

Question 242: Palette 242/260

JEE Mains 2005 MCQ

Due to the presence of an unpaired electron, free radicals are:

A

Chemically reactive

B

Chemically inactive

C

Anions

D

Cations

Question 243: Palette 243/260

JEE Mains 2004 MCQ

Consider the acidity of the carboxylic acids:
(a) PhCOOH
(b) o – NO₂C₆H₄COOH
(c) p – NO₂C₆H₄COOH
(d) m – NO₂C₆H₄COOH
Which of the following order is correct?

A

(b) > (d) > (a) > (c)

B

(b) > (d) > (c) > (a)

C

(a) > (b) > (c) > (d)

D

(b) > (c) > (d) > (a)

Question 244: Palette 244/260

JEE Mains 2004 MCQ

Which of the following will have meso-isomer also?

A

2- chlorobutane

B

2- hydroxyopanoic acid

C

2,3 – dichloropentane

D

2-3- dichlorobutane

Question 245: Palette 245/260

JEE Mains 2004 MCQ

The $IUPAC$ name of the compound is

A

$3,3$-dimethyl - $1$ - cyclohexanol

B

$1,1$-dimethyl- $3$ -hydroxy cyclohexane

C

$3,3$-dimethyl- $1$ -hydroxy cyclohexane

D

$1,1$-dimethyl - $3$ - cyclohexanol

Question 246: Palette 246/260

JEE Mains 2004 MCQ

Which of the following is the strongest base ?

A

B

C

D

Question 247: Palette 247/260

JEE Mains 2004 MCQ

Amongst the following compounds, the optically active alkane having lowest molecular mass is

A

B

C

D

Question 248: Palette 248/260

JEE Mains 2004 MCQ

Rate of the reaction



is fastest when $Z$ is

A

$O{C_2}{H_5}$

B

$N{H_2}$

C

$Cl$

D

$OCOC{H_3}$

Question 249: Palette 249/260

JEE Mains 2004 MCQ

Which one the following does not have sp² hybridized carbon?

A

Acetone

B

Acetamide

C

Acetonitrile

D

Acetic acid

Question 250: Palette 250/260

JEE Mains 2004 MCQ

Which of the following compound is not chiral?

A

1- chloropentane

B

3-chloro-2- methyl pentane

C

1-chloro -2- methyl pentane

D

2- chloropentane

Question 251: Palette 251/260

JEE Mains 2003 MCQ

Among the following four structures $i$ to $iv,$



it is true that

A

only $i$ and $ii$ are chiral compounds

B

only $iii$ is a chiral compound

C

only $ii$ and $iv$ are chiral compounds

D

all four are chiral compounds

Question 252: Palette 252/260

JEE Mains 2003 MCQ

The IUPAC name of CH₃COCH(CH₃)₂ is

A

2-methyl-3-butaone

B

4-methylisopropyl 1 ketone

C

3-methyl-2-butaone

D

Isopropylmethyl ketone

Question 253: Palette 253/260

JEE Mains 2003 MCQ

The general formula C_nH_2nO₂ could be for open chain

A

carboxylic acids

B

diols

C

dialdehydes

D

deketones

Question 254: Palette 254/260

JEE Mains 2003 MCQ

In the anion HCOO^$-$ the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?

A

The C = O bond is weaker than the C-O bond

B

The anion HCOO- has two resonating structures

C

The anion is obtained by removal of a proton from the acid molecule

D

Electronic orbitals of carbon atom are hybridised

Question 255: Palette 255/260

JEE Mains 2002 MCQ

Racemic mixture is formed by mixing two

A

isomeric compounds

B

enantiomers with chiral compounds

C

meso compounds

D

optical isomers

Question 256: Palette 256/260

JEE Mains 2002 MCQ

Which of the following does not show geometrical isomerism?

A

1,2-dichloro-1-pentene

B

1,3-dichloro-2-pentene

C

1,1-dichloro-1-pentene

D

1,4-dichloro-2-pentene

Question 257: Palette 257/260

JEE Mains 2002 MCQ

Arrangement of (CH₃)₃C-, (CH₃)₂CH-, CH₃-CH₂- when attached to benzyl or an unsaturated group in increasing order of inductive effect is

A

(CH₃)₃C- < (CH₃)₂CH- < CH₃-CH₂

B

CH₃-CH₂- < (CH₃)₂CH- < (CH₃)₃C-

C

(CH₃)₂CH- < (CH₃)₃C- < CH₃-CH₂

D

(CH₃)₃C- < CH₃-CH₂- < CH₃)₂CH-

Question 258: Palette 258/260

JEE Mains 2002 MCQ

Which of the following compounds has wrong $IUPAC$ name ?

A

B

C

D

Question 259: Palette 259/260

JEE Mains 2002 MCQ

A similarity between optical and geometrical isomerism is that

A

each forms equal number of isomers for a given compound

B

if in a compound one is present then so is the other

C

both are included in stereoisomerism

D

they have no similarity

Question 260: Palette 260/260

JEE Mains 2002 MCQ

Following types of compounds (as $I, II$ )



are studied in terms of isomerism in :

A

chain isomerism

B

position isomerism

C

conformers

D

stereoisomerism