Question 1: Palette 1/35

JEE Advanced 2023 MCQ

Match the reactions in List-I with the features of their products in List-II and choose the correct option.

List - I	List - II
(P)	(1) Inversion of configuration
(Q)	(2) Retention of configuration
(R)	(3) Mixture of enantiomers
(S)	(4) Mixture of structural isomers
	(5) Mixture of diastereomers

A

$\mathrm{P} \rightarrow 1 ; \mathrm{Q} \rightarrow 2 ; \mathrm{R} \rightarrow 5 ; \mathrm{S} \rightarrow 3$

B

$\mathrm{P} \rightarrow 2 ; \mathrm{Q} \rightarrow 1 ; \mathrm{R} \rightarrow 3 ; \mathrm{S} \rightarrow 5$

C

$P \rightarrow 1 ; Q \rightarrow 2 ; R \rightarrow 5 ; S \rightarrow 4$

D

$\mathrm{P} \rightarrow 2 ; \mathrm{Q} \rightarrow 4 ; \mathrm{R} \rightarrow 3 ; \mathrm{S} \rightarrow 5$

Question 2: Palette 2/35

JEE Advanced 2021 MCQ

Correct match of the C-H bonds (shown in bold) in Column J with their BDE in Column K is

Column J Molecule	Column K BDE (kcal $mo{l^{ - 1}}$)
(P) H-CH($C{H_3}$)$_2$	(i) 132
(Q) H-CH$_2$Ph	(ii) 110
(R) H-CH=CH$_2$	(iii) 95
(S) H-C $ \equiv $ CH	(iv) 88

A

P - iii, Q - iv, R - ii, S - i

B

P - i, Q - ii, R - iii, S - iv

C

P - iii, Q - ii, R - i, S - iv

D

P - ii, Q - i, R - iv, S - ii

Question 3: Palette 3/35

JEE Advanced 2021 MCQ

For the following reaction

CH₄(g) + Cl₂(g) $\buildrel {light} \over \longrightarrow $ CH₃Cl(g) + HCl (g)

the correct statement is

A

Initiation step is exothermic with $\Delta$H$^\circ$ = $-$58 kcal mol^$-$1.

B

Propagation step involving ${}^ \bullet C{H_3}$ formation is exothermic with $\Delta$H$^\circ$ = $-$2 kcal mol^$-$1.

C

Propagation step involving CH₃Cl formation is endothermic with $\Delta$H$^\circ$ = +27 kcal mol^$-$1.

D

The reaction is exothermic with $\Delta$H$^\circ$ = $-$25 kcal mol^$-$1.

Question 4: Palette 4/35

JEE Advanced 2021 MCQ

Among the following, the conformation that corresponds to the most stable conformation of meso-butane-2,3-diol is

A

B

C

D

Question 5: Palette 5/35

JEE Advanced 2020 MCQ

Newman projections P, Q, R and S are shown below :



Which one of the following options represents identical molecules?

A

P and Q

B

Q and S

C

Q and R

D

R and S

Question 6: Palette 6/35

JEE Advanced 2020 MCQ

Which of the following structures has the IUPAC name

3-ethynyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid?

A

B

C

D

Question 7: Palette 7/35

JEE Advanced 2020 MCQ

The Fischer projection of D-erythrose is shown below :



D-erythrose and its isomers are listed as P, Q, R, and S in Column - I. Choose the correct relationship of P, Q, R, and S with D-erythrose from Column - II.

A

P	Q	R	S
2	3	2	2

B

P	Q	R	S
3	1	1	2

C

P	Q	R	S
2	1	1	3

D

P	Q	R	S
2	3	3	1

Question 8: Palette 8/35

JEE Advanced 2020 MSQ

Consider the following four compounds, I, II, III, and IV.



Choose the correct statement(s)

A

The order of basicity is II > I > III > IV.

B

The magnitude of pK_b difference between I and II is more than that between III and IV.

C

Resonance effect is more in III than in IV.

D

Steric effect makes compound IV more basic than III.

Question 9: Palette 9/35

JEE Advanced 2020 MSQ

With respect to the compounds I-V, choose the correct statement(s).

A

The acidity of compound I is due to delocalisation in the conjugate base.

B

The conjugate base of compound IV is aromatic.

C

Compound II becomes more acidic, when it has a $-$NO₂ substituent.

D

The acidity of compounds follows the order

I > IV > V > II > III.

Question 10: Palette 10/35

JEE Advanced 2017 MSQ

For the following compounds, the correct statement(s) with respect to nucleophilic substitution reaction is (are)

A

${\rm I}$ and ${\rm I}$${\rm I}$${\rm I}$ follow ${S_N}1$ mechanism

B

${\rm I}$ and ${\rm II}$ follow ${S_N}2$ mechanism

C

Compound ${\rm IV}$ undergoes inversion of configuration

D

The order of reactivity for ${\rm I},$ ${\rm I}{\rm I}{\rm I}$ and ${\rm IV}$ is : ${\rm I}V > {\rm I} > {\rm I}{\rm I}{\rm I}$

Question 11: Palette 11/35

JEE Advanced 2017 MSQ

The correct statements(s) for the following addition reactions is (are)

A

$O$ and $P$ are identical molecules

B

($M$ and $O$) and ($N$ and $P$) are two pairs of diastereomers

C

($M$ and $O$) and ($N$ and $P$) are two pairs of enantiomers

D

Bromination proceeds through trans-addition in both the reactions

Question 12: Palette 12/35

JEE Advanced 2017 MSQ

The IUPAC name(s) of the following compound is (are)

A

$1$-chloro-$4$-methylbenzene

B

$4$-chlorotoluene

C

$4$-methylchlorobenzene

D

$1$-methyl-$4$-chlorobenzene

Question 13: Palette 13/35

JEE Advanced 2014 MCQ

Isomers of hexane, based on their branching, can be divided into three distinct classes as shown in the figure.

The correct order of their boiling point is

A

I > II > III

B

III > II > I

C

II > III > I

D

III > I > III

Question 14: Palette 14/35

JEE Advanced 2014 MSQ

The correct combination of names for isomeric alcohols with molecular formula C₄H₁₀O is/are

A

tert-butanol and 2-methylpropan-2-ol

B

tert-butanol and 1, 1-dimethylethan-1-ol

C

n-butanol and butan-1-ol

D

iso-butyl alcohol and 2-methylpropan-1-ol

Question 15: Palette 15/35

JEE Advanced 2013 MCQ

The hyperconjugative stabilities of tert-butyl cation and 2-butene, respectively, are due to

A

$\sigma \to p$ (empty) and $\sigma \to \pi^*$ electron delocalisations

B

$\sigma \to \sigma^*$ and $\sigma \to \pi$ electron delocalisations

C

$\sigma \to p$ (filled) and $\sigma \to \pi$ electron delocalisations

D

p (filled) $\to \sigma^*$ and $\sigma \to \pi^*$ electron delocalisations

Question 16: Palette 16/35

JEE Advanced 2012 MSQ

Which of the given statement(s) about N, O, P and Q with respect to M is(are) correct?

A

M and N are non-minor image stereoisomers.

B

M and O are identical.

C

M and P are enantiomers.

D

None of these.

Question 17: Palette 17/35

JEE Advanced 2012 MSQ

Which of the following molecules, in pure form, is(are) unstable at room temperature?

A

B

C

D

Question 18: Palette 18/35

JEE Advanced 2011 MCQ

Among the following compounds, the most acidic is

A

p-nitrophenol

B

p-hydroxybenzoic acid

C

o-hydroxybenzoic acid

D

p-toluic acid

Question 19: Palette 19/35

JEE Advanced 2011 MSQ

Among the given options, the compound(s) in which all the atoms are in one plane in all the possible conformations (if any) is(are)

A

B

C

H₂C = C = 0

D

H₂C = C = CH₂

Question 20: Palette 20/35

JEE Advanced 2010 MSQ

In the Newman projection for 2,2-dimethylbutane, X and Y can, respectively, be

A

H and H

B

H and C$_2$H$_5$

C

C$_2$H$_5$ and H

D

CH$_3$ and CH$_3$

Question 21: Palette 21/35

JEE Advanced 2009 MCQ

In the following carbocation, H/CH$_3$ that is most likely to migrate to the positively charged carbon is :

A

CH$_3$ at C-4

B

H at C-4

C

CH$_3$ at C-2

D

H at C-2

Question 22: Palette 22/35

JEE Advanced 2009 MCQ

The correct stability order of the following resonance structures is

A

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

B

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

C

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

D

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

Question 23: Palette 23/35

JEE Advanced 2009 MCQ

The correct acidity order of the following is

A

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

B

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

C

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

D

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

Question 24: Palette 24/35

JEE Advanced 2009 MCQ

The IUPAC name of the following compound is

A

4-Bromo-3-cyanophenol

B

2-Bromo-5-hydroxybenzonitrile

C

2-Cyano-4-hydroxybromobenzene

D

6-Bromo-3-hydroxybenzonitrile

Question 25: Palette 25/35

JEE Advanced 2009 MSQ

The correct statement(s) about the compound $\mathrm{H_3C(HO)HC-CH=CH-CH(OH)CH_3~~(X)}$ is (are)

A

The total number of stereoisomers possible for X is 6.

B

The total number of diastereomers possible for X is 3.

C

If the stereochemistry about the double bond in X in $trans$, the number of enantiomers possible for X is 4.

D

If the stereochemistry about the double bond in X is $cis$, the number of enantiomers possible for X is 2.

Question 26: Palette 26/35

JEE Advanced 2008 MCQ

The correct stability order for the following species is :

A

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

B

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

C

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

D

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

Question 27: Palette 27/35

JEE Advanced 2008 MCQ

Hyperconjugation involves overlapping of the following orbitals:

A

$\sigma-\sigma$

B

$\sigma-p$

C

$p-p$

D

$\pi-\pi$

Question 28: Palette 28/35

JEE Advanced 2008 MSQ

The correct statement(s) concerning the structures E, F and G is(are) :

A

E, F and G are resonance structures.

B

E, F and E, G are tautomers.

C

F and G are geometrical isomers.

D

F and G are diasteromers.

Question 29: Palette 29/35

JEE Advanced 2007 MCQ

The number of stereoisomers obtained by bromination of $trans$-2-butene is :

A

1

B

2

C

3

D

4

Question 30: Palette 30/35

JEE Advanced 2007 MCQ

Among the following the least stable resonance structure is :

A

B

C

D

Question 31: Palette 31/35

JEE Advanced 2007 MCQ

The number of structural isomers for C$_6$H$_{14}$ is :

A

3

B

4

C

5

D

6

Question 32: Palette 32/35

JEE Advanced 2006 MCQ

What are N and M?

A

6,6

B

6,4

C

4,4

D

3,3

Question 33: Palette 33/35

JEE Advanced 1991 MCQ

The hybridization of carbon atoms in C-C single bond of HC $ \equiv $ C - CH = CH₂ is

A

$sp^3 - sp^3$

B

$sp^2 - sp^3$

C

$sp - sp^2$

D

$sp^3 - sp$

Question 34: Palette 34/35

JEE Advanced 1987 MCQ

The IUPAC name of the compound
CH₂ = CH $-$ CH(CH₃)₂

A

1, 1-dimethyl-2-propene

B

3-methylbut-1-ene

C

2-vinylpropane

D

1 isopropylethylene

Question 35: Palette 35/35

JEE Advanced 1984 MCQ

The IUPAC name of the compound having the formula is :

A

3, 3, 3-trimethyl-1-propene

B

1, 1, 1-trimethyl-2-propene

C

3, 3-dimethylbut-1-ene

D

2, 2-dimethyl-3-butene