Question 1: Palette 1/101

NEET 2026 MCQ

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

A

3-ethyl-5-methylheptane

B

2,4-diethylhexane

C

3-methyl-5-ethylheptane

D

3,5-diethylhexane

Question 2: Palette 2/101

NEET 2026 MCQ

During Lassaigne's test, the elements present in an organic compound are converted from :

A

Ionic form to ionic form

B

Covalent form to ionic form

C

Covalent form to covalent form

D

Ionic form to covalent form

Question 3: Palette 3/101

NEET 2026 MCQ

$ \text { The following carbocation is stabilized by the interaction of the empty } p \text { orbital with } $

A

empty $\sigma^*$ and empty $\pi^*$ orbitals

B

filled $\sigma$ and filled $\pi$ orbitals

C

empty $\sigma$ and empty $\pi^*$ orbitals

D

empty $\sigma^*$ and filled $\pi$ orbitals

Question 4: Palette 4/101

NEET 2025 MCQ

How many products (including stereoisomers) are expected from monochlorination of the following compound?

A

5

B

6

C

2

D

3

Question 5: Palette 5/101

NEET 2025 MCQ

Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula $\mathrm{C}_4 \mathrm{H}_8 \mathrm{O}$ is :

A

10

B

11

C

6

D

8

Question 6: Palette 6/101

NEET 2025 MCQ

Among the given compounds I-III, the correct order of bond dissociation energy of C-H bond marked with * is :

A

III $>$ II $>$ I

B

II $>$ III $>$ I

C

II $>$ I $>$ III

D

I $>$ II $>$ III

Question 7: Palette 7/101

NEET 2025 MCQ

Match List-I with List-II

	List - I (Mixture)		List - II (Method of separation)
A	$\mathrm{CHCl}_3+\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2$	I	Distillation under reduced pressure
B	Crude oil in petroleum industry	II	Steam distillation
C	Glycerol from spent-lye	III	Fractional distillation
D	Aniline - water	IV	Simple distillation

Choose the correct answer from the options given below:

A

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

B

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

C

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

D

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

Question 8: Palette 8/101

NEET 2025 MCQ

Which one of the following compounds can exist as cis-trans isomers?

A

1, 1-Dimethylcyclopropane

B

1, 2-Dimethylcyclohexane

C

Pent-1-ene

D

2-Methylhex-2-ene

Question 9: Palette 9/101

NEET 2025 MCQ

Match List-I with List-II

	List - I (Ion)		List - II (Group Number in Cation Analysis)
A	$\mathrm{Co}^{2+}$	I	Group-I
B	$\mathrm{Mg}^{2+}$	II	Group-III
C	$\mathrm{Pb}^{2+}$	III	Group-IV
D	$\mathrm{Al}^{3+}$	IV	Group-VI

Choose the correct answer from the options given below :

A

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

B

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

C

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

D

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

Question 10: Palette 10/101

NEET 2024 MCQ

The correct IUPAC name of the compound

is :

A

4-ethyl-1-fluoro-2-nitrobenzene

B

4-ethyl-1-fluoro-6-nitrobenzene

C

3-ethyl-6-fluoro-1-nitrobenzene

D

1-ethyl-4-fluoro-3-nitrobenzene

Question 11: Palette 11/101

NEET 2024 MCQ

A steam volatile organic compound which is immiscible with water has a boiling point of $250^{\circ} \mathrm{C}$. During steam distillation, a mixture of this organic compound and water will boil :

A

above $100^{\circ} \mathrm{C}$ but below $250^{\circ} \mathrm{C}$

B

above $250^{\circ} \mathrm{C}$

C

at $250^{\circ} \mathrm{C}$

D

close to but below $100^{\circ} \mathrm{C}$

Question 12: Palette 12/101

NEET 2024 MCQ

Match List-I with List-II :

	List - I (Test/reagent)		List - II (Radical identified)
(A)	Lake Test	(I)	NO$_3^-$
(B)	Nessler's Reagent	(II)	Fe$^{3+}$
(C)	Potassium sulphocyanide	(III)	Al$^{3+}$
(D)	Brown Ring Test	(IV)	NH$_4^+$

Choose the correct answer from the options given below :

A

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

B

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

C

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

D

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

Question 13: Palette 13/101

NEET 2024 MCQ

Methyl group attached to a positively charged carbon atom stabilizes the carbocation due to

A

–I inductive effect

B

electromeric effect

C

hyperconjugation

D

mesomeric effect

Question 14: Palette 14/101

NEET 2024 MCQ

Given below are two statements:

Statement I : The boiling point of three isomeric pentanes follows the order

n-pentane > isopentane > neopentane

Statement II : When branching increases, the molecule attains a shape of sphere. This results in smaller surface area for contact, due to which the intermolecular forces between the spherical molecules are weak, thereby lowering the 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 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 15: Palette 15/101

NEET 2024 MCQ

The most stable carbocation among the following is :

A

B

C

D

Question 16: Palette 16/101

NEET 2024 MCQ

A compound with a molecular formula of $\mathrm{C}_6 \mathrm{H}_{14}$ has two tertiary carbons. Its IUPAC name is :

A

n-hexane

B

2-methylpentane

C

2,3-dimethylbutane

D

2,2-dimethylbutane

Question 17: Palette 17/101

NEET 2024 MCQ

On heating, some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is known as

A

Crystallization

B

Sublimation

C

Distillation

D

Chromatography

Question 18: Palette 18/101

NEET 2024 MCQ

During the preparation of Mohr's salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of $\mathrm{Fe}^{2+}$ ion?

A

dilute hydrochloric acid

B

concentrated sulphuric acid

C

dilute nitric acid

D

dilute sulphuric acid

Question 19: Palette 19/101

NEET 2023 MCQ

Which amongst the following compounds/species is least basic?

A

B

C

D

Question 20: Palette 20/101

NEET 2023 MCQ

Which amongst the following compounds will show geometrical isomerism?

A

Pent-1-ene

B

2, 3-Dimethylbut-2-ene

C

2-Methylprop-1-ene

D

3, 4-Dimethylhex-3-ene

Question 21: Palette 21/101

NEET 2023 MCQ

The correct order for the rate of $\alpha,\beta$-dehydrohalogenation for the following compounds is _________.

A

(i) < (ii) < (iii)

B

(ii) < (i) < (iii)

C

(iii) < (ii) < (i)

D

(ii) < (iii) < (i)

Question 22: Palette 22/101

NEET 2023 MCQ

Given below are two statements:

Statement I : In an organic compound, when inductive and electromeric effects operate in opposite directions, the inductive effect predominates.

Statement II : Hyperconjugation is observed in o-xylene.

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 true.

D

Both Statement-I and Statement-II are false.

Question 23: Palette 23/101

NEET 2023 MCQ

The number of $\sigma$ bonds, $\pi$ bonds and lone pair of electrons in pyridine, respectively are:

A

12, 3, 0

B

11, 3, 1

C

12, 2, 1

D

11, 2, 0

Question 24: Palette 24/101

NEET 2023 MCQ

In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with $\mathrm{Fe}^{3+}$ due to the formation of-

A

NaSCN

B

$\left[\mathrm{Fe}(\mathrm{CN})_{5} \mathrm{NOS}\right]^{4-}$

C

$[\mathrm{Fe}(\mathrm{SCN})]^{2+}$

D

$\mathrm{Fe}_{4}\left[\mathrm{Fe}\left(\mathrm{CN}_{6}\right)\right]_{3} \cdot \mathrm{xH}_{2} \mathrm{O}$

Question 25: Palette 25/101

NEET 2023 MCQ

Amongst the given options which of the following molecules/ion acts as a Lewis acid?

A

$\mathrm{H}_{2} \mathrm{O}$

B

$\mathrm{BF}_{3}$

C

$\mathrm{OH}^{-}$

D

$\mathrm{NH}_{3}$

Question 26: Palette 26/101

NEET 2023 MCQ

Consider the following compounds/species:

The number of compounds/species which obey Huckel's rule is ___________.

A

6

B

2

C

5

D

4

Question 27: Palette 27/101

NEET 2022 MCQ

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

Assertion (A) : Chlorine is an electron withdrawing group but it is ortho, para directing in electrophilic aromatic substitution.

Reason (R) : Inductive effect of chlorine destabilises the intermediate carbocation formed during the electrophilic substitution, however due to the more pronounced resonance effect, the halogen stabilises the carbocation at ortho and para positioins.

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

A

(A) is not correct but (R) is correct

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 correct but (R) is not correct

Question 28: Palette 28/101

NEET 2022 MCQ

Predict the order of reactivity of the following four isomers towards S_N2 reaction.

(I) CH₃CH₂CH₂CH₂Cl

(II) CH₃CH₂CH(Cl)CH₃

(III) (CH₃)₂CHCH₂Cl

(IV) (CH₃)₃CCl

A

(IV) > (II) > (III) > (I)

B

(IV) > (III) > (II) > (I)

C

(I) > (II) > (III) > (IV)

D

(I) > (III) > (II) > (IV)

Question 29: Palette 29/101

NEET 2022 MCQ

What is the hybridization shown by C₁ and C₂ carbons, respectively in the given compound?

OHC $-$ CH = CH $-$ CH₂COOCH₃

A

sp³ and sp³

B

sp² and sp³

C

sp² and sp²

D

sp³ and sp²

Question 30: Palette 30/101

NEET 2022 MCQ

Which of the following is the most stable carbocation?

A

B

C

D

Question 31: Palette 31/101

NEET 2022 MCQ

Which compound amongst the following is not an aromatic compound?

A

B

C

D

Question 32: Palette 32/101

NEET 2022 MCQ

The incorrect statement regarding chirality is

A

S_N1 reaction yields 1 : 1 mixture of both enantiomers

B

The product obtained by S_N2 reaction of haloalkane having chirality at the reactive site shows inversion of configuration

C

Enantiomers are superimposable mirror images on each other

D

A racemic mixture shows zero optical rotation

Question 33: Palette 33/101

NEET 2022 MCQ

The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?

A

B

C

D

Question 34: Palette 34/101

NEET 2022 MCQ

The correct IUPAC name of the following compound is

A

1-bromo-5-chloro-4-methylhexan-3-ol

B

6-bromo-2-chloro-4-methythexan-4-ol

C

1-bromo-4-methyl-5-chlorohexan-3-ol

D

6-bromo-4-methyl-2-chlorohexan-4-ol

Question 35: Palette 35/101

NEET 2021 MCQ

The compound which shows metamerism is :

A

C₄H₁₀O

B

C₅H₁₂

C

C₃H₈O

D

C₃H₆O

Question 36: Palette 36/101

NEET 2021 MCQ

Dihedral angle of least stable conformer of ethane is :

A

0$^\circ$

B

120$^\circ$

C

180$^\circ$

D

60$^\circ$

Question 37: Palette 37/101

NEET 2020 MCQ

Paper chromatography is an example of :

A

Partition chromatography

B

Thin layer chromatography

C

Column chromatography

D

Adsorption chromatography

Question 38: Palette 38/101

NEET 2020 MCQ

A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?

A

+R effect of $ - $ CH₃ groups

B

$ - $ R effect of $ - $ CH₃ groups

C

Hyperconjugation

D

$ - $ I effect of $ - $ CH₃ groups

Question 39: Palette 39/101

NEET 2019 MCQ

The compound that is most difficult to protonate is :

A

B

C

D

Question 40: Palette 40/101

NEET 2018 MCQ

Which of the following molecules represents the order of hybridisation sp² , sp² , sp, sp from left to right atoms?

A

HC $ \equiv $ C — C $ \equiv $ CH

B

CH₂ = CH — C $ \equiv $ CH

C

CH₂ = CH — CH = CH₂

D

CH₃ — CH = CH — CH₃

Question 41: Palette 41/101

NEET 2018 MCQ

Which of the following carbocations is expected to be most stable?

A

B

C

D

Question 42: Palette 42/101

NEET 2018 MSQ

Which of the following is correct with respect to – I effect of the substituents? (R = alkyl)

A

– NH₂ < – OR < – F

B

– NR₂ < – OR < – F

C

– NH₂ > – OR > – F

D

– NR₂ > – OR > – F

Question 43: Palette 43/101

NEET 2017 MCQ

The correct statement regarding electrophile is

A

electrophile is a negatively charged species and form a bond by accepting a pair of electrons from another electrophile

B

electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile

C

electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from a nucleophile

D

electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile.

Question 44: Palette 44/101

NEET 2017 MCQ

The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is

A

chromatography

B

crystallisation

C

steam distillation

D

sublimation.

Question 45: Palette 45/101

NEET 2017 MCQ

The IUPAC name of the compound

A

5-formylhex-2-en-3-one

B

5-methyl-4-oxohex-2-en-5-al

C

3-keto-2-methylhex-5-enal

D

3-keto-2-methylhex-4-enal

Question 46: Palette 46/101

NEET 2016 MCQ

Which among the given molecules can exhibit tautomerism?

A

III only

B

Both I and III

C

Both I and II

D

Both II and III

Question 47: Palette 47/101

NEET 2016 MCQ

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is

A

the eclipsed conformation of ethane is more stable than staggered conformation even through the eclipsed conformation has torsional strain

B

the staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain

C

the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain

D

the eclipsed conformation of ethane is more stable than stggered conformation, because eclipsed conformation has no torsional strain.

Question 48: Palette 48/101

NEET 2015 MCQ

Which of the following statements is not correct for a nucleophile?

A

Ammonia is a nucleophile.

B

Nucleophiles attack low e^$-$ density sites.

C

Nucleophiles are not electron seeking.

D

Nucleophile is a Lewis acid.

Question 49: Palette 49/101

NEET 2015 MCQ

The possible stereo-structures of CH₃CHOHCOOH, which are optically active, are called

A

atropisomers

B

enantiomers

C

mesomers

D

diastereomers

Question 50: Palette 50/101

NEET 2015 MCQ

Given :

Which of the given compounds can exhibit tautomerism?

A

II and III

B

I, II and III

C

I and II

D

I and III

Question 51: Palette 51/101

NEET 2015 MCQ

The total number of $\pi $-bond electrons in the following structure is

A

12

B

16

C

4

D

8

Question 52: Palette 52/101

NEET 2015 MCQ

Which of the following is the most correct electron displacement for a nucleophilic reaction to take place?

A

B

C

D

Question 53: Palette 53/101

NEET 2015 MCQ

Consider the following compounds :

Hyperconjunction occurs in

A

III only

B

I and III

C

I only

D

II only

Question 54: Palette 54/101

NEET 2015 MCQ

The enolic form of ethyl accetoacetate as shown below has

A

9 sigma bonds and 2 pi-bonds

B

9 sigma bonds and 1 pi-bond

C

18 sigma bonds and 2 pi-bonds

D

16 sigma bonds and 1 pi-bond.

Question 55: Palette 55/101

NEET 2015 MCQ

In which of the following compounds, the C$-$Cl bond ionisation shall give most stable carbonium ion?

A

B

C

D

Question 56: Palette 56/101

NEET 2015 MCQ

In Duma's method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is

A

16.75

B

15.76

C

17.36

D

18.20

Question 57: Palette 57/101

NEET 2014 MCQ

In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M H₂SO₄. The percentage of nitrogen in the soil is

A

37.33

B

45.33

C

35.33

D

43.33

Question 58: Palette 58/101

NEET 2013 MCQ

What is the hybridisation state of benzyl carbonium ion?

A

sp²

B

spd²

C

sp²d

D

sp³

Question 59: Palette 59/101

NEET 2013 MCQ

Given :

I and II are

A

identical

B

a pair of conformers

C

a pair of geometrical isomers

D

a pair of optical isomers

Question 60: Palette 60/101

NEET 2013 MCQ

Which of the following chemical system is non aromatic ?

A

B

C

D

Question 61: Palette 61/101

NEET 2013 MCQ

Arrange the following in increasing order of stability

A

5 < 4 < 3 < 1< 2

B

4 < 5 < 3 < 1 < 2

C

1 < 5 < 4 < 3 < 2

D

5 < 4 < 3 < 2 < 1

Question 62: Palette 62/101

NEET 2013 MCQ

Homolytic fission of the following alkanes forms free radicals CH₃ $-$ CH₃, CH₃ $-$ CH₂ $-$ CH₃, (CH₃)₂CH $-$ CH₃, CH₃ $-$ CH₂ $-$CH(CH₃)₂.
Increasing order of stability of the radicals is

A

$\eqalign{ & {\left( {C{H_3}} \right)_2}\mathop C\limits^ \bullet \, - \,C{H_2}C{H_3}\, < C{H_3}\, - \,\mathop C\limits^ \bullet H - \,C{H_3} \cr & < C{H_3}\, - \,\mathop C\limits^ \bullet {H_2}\, < {\left( {C{H_3}} \right)_3}\mathop C\limits^ \bullet \cr} $

B

$\eqalign{ & C{H_3}\, - \,\mathop C\limits^ \bullet {H_2}\, < \,C{H_3}\, - \,\mathop C\limits^ \bullet HH\, - \,C{H_3}\, < \cr & {\left( {C{H_3}} \right)_2}\mathop C\limits^ \bullet \, - \,C{H_2}\, - \,C{H_3}\, < \,{\left( {C{H_3}} \right)_3}\mathop C\limits^ \bullet \cr} $

C

$\eqalign{ & C{H_3} - \mathop C\limits^ \bullet {H_2} < C{H_3} - \mathop C\limits^ \bullet H - C{H_3} < \cr & {\left( {C{H_3}} \right)_3}\mathop C\limits^ \bullet \, < {\left( {C{H_3}} \right)_2}\mathop C\limits^ \bullet \, - C{H_2}C{H_3} \cr} $

D

$\eqalign{ & {\left( {C{H_3}} \right)_3}\mathop C\limits^ \bullet \, < {\left( {C{H_3}} \right)_2}\mathop C\limits^ \bullet \, - C{H_2}C{H_3} < \cr & C{H_3} - \mathop C\limits^ \bullet H - C{H_3} < C{H_3} - \mathop C\limits^ \bullet {H_2} \cr} $

Question 63: Palette 63/101

NEET 2013 MCQ

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating ?

A

$-$COOH

B

$-$ NO₂

C

$-$ C $ \equiv $ N

D

$-$ SO₃H

Question 64: Palette 64/101

NEET 2013 MCQ

Structure of the compound whose IUPAC name is 3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is

A

B

C

D

Question 65: Palette 65/101

NEET 2013 MCQ

The radical,

is aromatic because it has

A

7 p-orbitals and 7 unpaired electrons

B

6 p-orbitals and 7 unpaired electrons

C

6 p-orbitals and 6 unpaired electrons

D

7 p-orbitals and 6 unpaired electrons.

Question 66: Palette 66/101

NEET 2013 MCQ

The structure of isobutyl group in an organic compound is

A

B

C

D

Question 67: Palette 67/101

NEET 2012 MCQ

Which nomenclature is not according to IUPAC system?

A

B

C

D

Question 68: Palette 68/101

NEET 2012 MCQ

Which of the following acids does not exhibit optical isomerism?

A

Maleic acid

B

$\alpha $-amino acids

C

Lactic acid

D

Tartaric acid

Question 69: Palette 69/101

NEET 2011 MCQ

The IUPAC name of the following compound is

A

trans-2-chloro-3-iodo-2-pentene

B

cis-3-iodo-4-chloro-3-pentane

C

trans-3-iodo-4-chloro-3-pentene

D

cis-2-chloro -3-iodo-2-pentene.

Question 70: Palette 70/101

NEET 2011 MCQ

Considering the state of hybridization of carbon atoms, find out the molecule among the following which is linear ?

A

CH₃ $-$ CH $=$ CH $-$ CH₃

B

CH₃ $-$ C$ \equiv $C $-$ CH₃

C

CH₂ $=$ CH $-$ CH₂ $-$ C$ \equiv $CH

D

CH₃ $-$ CH₂ $-$ CH₂ $-$ CH₃

Question 71: Palette 71/101

NEET 2011 MCQ

Which one of the following is most reactive towards electrophilic reagent?

A

B

C

D

Question 72: Palette 72/101

NEET 2011 MCQ

The correct IUPAC name for the compound is

A

4-ethyl-3-propylhex-1-ene

B

3-ethyl-4-ethenylheptane

C

3-ethyl-4-propylhex-5-ene

D

3-(1 -ethylpropyl)hex- 1 -ene.

Question 73: Palette 73/101

NEET 2010 MCQ

Which of the following conformers for ethylene glycol is most stable?

A

B

C

D

Question 74: Palette 74/101

NEET 2010 MCQ

Which of the following species is not electrophilic in nature?

A

$\mathop C\limits^ + l$

B

BH₃

C

H₃$\mathop O\limits^ + $

D

$\mathop N\limits^ + $O₂

Question 75: Palette 75/101

NEET 2010 MCQ

The IUPAC name of the compound
CH₃CH$=$CHC$ \equiv $CH is

A

pent-4-yn-2-ene

B

pent-3-en-1-yne

C

pent-2-en-4-yne

D

pent-1-yn-3-ene

Question 76: Palette 76/101

NEET 2010 MCQ

In the following the most stable conformation of n-butane is

A

B

C

D

Question 77: Palette 77/101

NEET 2010 MCQ

Which one of the following is most reactive towards electrophilic reagent?

A

B

C

D

Question 78: Palette 78/101

NEET 2009 MCQ

The IUPAC name of the compound having the formula
CH$ \equiv $C$-$CH$=$CH₂ is

A

1-butyne-3-ene

B

but-1-yne-3-ene

C

1-butene-3-yne

D

3-butene-1-yne.

Question 79: Palette 79/101

NEET 2008 MCQ

Base strength of

is in the order of

A

(i) > (iii) > (ii)

B

(i) > (ii) > (iii)

C

(ii) > (i) > (iii)

D

(iii) > (ii) > (i)

Question 80: Palette 80/101

NEET 2008 MCQ

The stability of carbanions in the following.

is in the order of

A

(iv) > (ii) > (iii) > (i)

B

(i) > (iii) > (ii) > (iv)

C

(i) > (ii) > (iii) > (iv)

D

(ii) > (iii) > (iv) > (i)

Question 81: Palette 81/101

NEET 2008 MCQ

How many stereoisomers does this molecule have?

CH₃CH$=$CHCH₂CHBrCH₃

A

8

B

2

C

4

D

6

Question 82: Palette 82/101

NEET 2008 MCQ

Which one of the following is most reactive towards electrophilic attack?

A

B

C

D

Question 83: Palette 83/101

NEET 2007 MCQ

For (i) I^$-$, (ii) Cl^$-$, (iii) Br^$-$, the increasing order of nucleophilicity would be

A

Cl^$-$ < Br^$-$ < I^$-$

B

I^$-$ < Cl^$-$ < Br^$-$

C

Br^$-$ < Cl^$-$ < I^$-$

D

I^$-$ < Br^$-$ < Cl^$-$

Question 84: Palette 84/101

NEET 2007 MCQ

The order of decreasing reactivity towards an electrophilic reagent, for the following would be
(i) benzene
(ii) toluene
(iii) chlorobenzene
(iv) phenol

A

(ii) > (iv) > (i) > (iii)

B

(iv) > (iii) > (ii) > (i)

C

(iv) > (ii) > (i) > (iii)

D

(i) > (ii) > (iii) > (iv)

Question 85: Palette 85/101

NEET 2007 MCQ

If there is no rotation of plane polarised light by a compound in a specific solvent, through to be chiral, it may mean than

A

the compound is certainly meso

B

there is no compound in the solvent

C

the compound may be a racemic mixture

D

the compound is certainly a chiral.

Question 86: Palette 86/101

NEET 2006 MCQ

The IUPAC name of



is

A

1-chloro-1-oxo-2, 3-dimethylpentane

B

2-ethyl-3-methylbutanoyl chloride

C

2, 3-dimethylpentanoyl chloride

D

3, 4-dimethylpentanoyl chloride.

Question 87: Palette 87/101

NEET 2005 MCQ

The chirality of the compound

A

R

B

S

C

E

D

Z

Question 88: Palette 88/101

NEET 2005 MCQ

Which one of the following pairs represents stereoisomerism?

A

Structural isomerism and gemetrical isomerism

B

Optical isomerism and geometrical isomerism

C

Chain isomerism and rotational isomerism

D

Linkage isomerism and geometrical isomerism.

Question 89: Palette 89/101

NEET 2005 MCQ

Which amongst the following is the most stable carbocation?

A

$\mathop C\limits^ + $H₃

B

CH₃$\mathop C\limits^ + $H₂

C

D

Question 90: Palette 90/101

NEET 2005 MCQ

Names of some compounds are given. Which one is not in IUPAC system?

A

B

C

D

Question 91: Palette 91/101

NEET 2005 MCQ

The best method for the separation of naphthalene and benzoic acid from their mixture is

A

distillation

B

sublimation

C

chromatography

D

crystallisation.

Question 92: Palette 92/101

NEET 2004 MCQ

The molecular formula of diphenyl methane,



How many structural isomers are possible when one of the hydrogen is replaced by a chlorine atom ?

A

6

B

4

C

8

D

7

Question 93: Palette 93/101

NEET 2003 MCQ

Which of the following pairs of compounds are enantiomers?

A

B

C

D

Question 94: Palette 94/101

NEET 2003 MCQ

Name of the compound given below is

A

4-ethyl-3-methyloctane

B

3-methyl-4-ethyloctane

C

2, 3-diethylheptane

D

5-ethyl-6-methyloctane

Question 95: Palette 95/101

NEET 2003 MCQ

Which one of the following orders of acid strength is correct ?

A

RCOOH > ROH > HOH > HC $ \equiv $ CH

B

RCOOH > HOH > ROH > HC $ \equiv $ CH

C

RCOOH > HOH > HC $ \equiv $ CH > ROH

D

RCOOH > HC $ \equiv $ CH > HOH > ROH

Question 96: Palette 96/101

NEET 2002 MCQ

IUPAC name of the following is

CH₂ $=$ CH $-$ CH₂ $-$ CH₂ $-$ C $ \equiv $ CH

A

1-hexyne-5-ene

B

1, 5 -hexenyne

C

1-hexene-5-yne

D

1,5-hexynene.

Question 97: Palette 97/101

NEET 2002 MCQ

Geometrical isomers differ in

A

position of functional group

B

position of atoms

C

spatial arrangement of atoms

D

length of carbon chain.

Question 98: Palette 98/101

NEET 2001 MCQ

In steam distillation of toluene, the pressure of toluene in vapour is

A

equal to pressure of barometer

B

Less than pressure of barometer

C

equal to vapour pressure of toluene in simple distillation

D

more than vapour pressure of toluene in simple distillation.

Question 99: Palette 99/101

NEET 2001 MCQ

The correct acidic order of the following is

A

I > II > III

B

III > I > II

C

II > III > I

D

I > III > II

Question 100: Palette 100/101

NEET 2001 MCQ

A compound of molecular formula C₇H₁₆ shows optical isomerism, compound will be

A

2, 3-dimethylpentane

B

2, 2-dimethylbutane

C

2-methylhexane

D

none of these

Question 101: Palette 101/101

NEET 2001 MCQ

The incorrect IUPAC name is

A

B

C

D