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Organic Chemistry

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Chapter Elite-20 Challenge Zone

Target Advanced

JEE Main 2026

LEVELOlympiad

The List-II contains products obtained from the reaction of compounds in List-I with $O_{3} / Zn-H_{2} O$ followed by cyclization (via more stable enolate) in the presence of aqueous NaOH. Match each entry in List-I with appropriate entry in List-II and choose the correct option.

List-I

List-II

Comprehension Passage

Consider the following reaction sequence in which J, K, L and M are the major products. Given: Atomic mass (in amu): H : 1, C : 12, N : 14, O : 16, S : 32, Br : 80, Ba : 137

Question 1:

The volume of 1 M aqueous $H_{2} SO_{4}$ required to completely neutralize the ammonia evolved from 5.72 g of L in Kjeldahl's method of nitrogen estimation is ____ mL.

Question 2:

In sulphur estimation by Carius method, the amount of $BaSO_{4}$ formed from 3.79 g of M is ____ g.

JEE Main 2025

LEVELJEE Advanced

The major products obtained from the reactions in List-II are the reactants for the named reactions mentioned in List-I. Match each entry in List-I with the appropriate entry in List-II and choose the correct options.

List-I

Hoffmann bromamide degradation reaction

(S)

Cannizzaro reaction

List-II

(1)

Toluene

(i) CrO_{2} Cl_{2} / CS_{2}, (ii) H_{3} O^{+}

(2)

Benzoic acid

(i) PCl_{5}, (ii) NH_{3}, (iii) P_{4} O_{10}, Δ

(3)

Nitrobenzene

(i) Fe, HCl, (ii) HCl, NaNO_{2} (273 - 278 K), H_{2} O

(4)

Toluene

(i) Cl_{2} / h ν, H_{2} O, (ii) Tollen’s reagent, (iii) SO_{2} Cl_{2}, (iv) NH_{3}

(5)

Aniline

(i) (CH_{3} CO)_{2} O, Pyridine, (ii) HNO_{3}, H_{2} SO_{4}, 288 K, (iii) aq. NaOH

JEE Main 2025

LEVELJEE Advanced

The reaction sequence given below is carried out with 16 moles of X. The yield of the major product in each step is given below the product in parentheses. The amount (in grams) of S produced is_______. Use: Atomic mass (in amu): H = 1, C = 12, O = 16, Br = 80

JEE Advanced 2025

LEVELJEE Advanced

For the reaction sequence given below, the correct statement(s) is(are)

* Multiple Correct Options

(A)

P is optically active.

(B)

S gives Bayer's test.

(C)

Q gives effervescence with aq. NaHCO

_{3}

Monocyclic compounds P, Q, R and S are the major products formed in the reaction sequences given below. The product having the highest number of unsaturated carbon atom(s) is-

In the following reaction sequence Q, R, S and T are the major products. The correct statement(s) about Q, R, S and T is (are)

* Multiple Correct Options

(A)

(A) S on warming with ammoniacal AgNO3 results in the formation of silver mirror.

(B)

(B) Q on treatment with Cl2 (excess)/ UV gives gammaxane.

(C)

(D)

(D) R on acid catalyzed intermolecular cyclization followed by treatment with Zn-Hg/HCl gives 9, 10-dihydroxyanthracene.

JEE Main 2026

LEVELJEE Advanced

Match the major products obtained in the reactions given in List-I with the corresponding structures in List-II and choose the correct option.

List-I

(P)

aqueous NaOH

(Q)

1. (CH_{3} CO)_{2} O 2. Na_{2} CO_{3}

(R)

aqueous NaOH

(S)

aqueous Na_{2} CO_{3}

List-II

Considering $LiBH_{4}$ reduces an ester group to the corresponding alcohol and does not reduce a carboxylic acid group, the correct statement about the major products P, Q R and S is

(A)

P & Q are identical, and R & S are diastereomers.

(B)

P & Q are diastereomers, and R & S are identical.

(C)

P & Q are diastereomers, and R & S are diastereomers.

(D)

P & Q are identical, and R & S are identical.

JEE Advanced 2023

LEVELJEE Advanced

Comprehension Passage

A trinitro compound, 1, 3,5 tris-(4-nitrophenyl) benzene, on complete reaction with an excess of Sn/HCl gives major product, which on treatment with an excess of NaNO2/HCl at 0°C provides P as the product. P, upon treatment with excess of H2O at room temperature, gives the product Q. Bromination of Q in aqueous medium furnishes the product R. The compound P upon treatment with an excess of phenol under basic conditions gives the product S. The molar mass difference between compounds Q and R is 474 mol^{-1} and between compounds P and S is 172.5 g mol^{-1}.

Question 1:

The number of heteroatoms present in one molecule of R is _____. [Use: Molar mass (in g mol^{-1}): H = 1, C = 12, N = 14, O = 16, Br = 80, Cl = 35.5 Atoms other than C and H are considered as heteroatoms]

Question 2:

The total number of carbon atoms and heteroatoms present in one molecule of S is _____. [Use: Molar mass in g mol^{-1}]: H = 1, C = 12, N = 14, O = 16, Br = 80, Cl = 35.5 Atoms other than C and H are considered as heteroatoms

JEE Advanced 2019

LEVELJEE Advanced

Comprehension Passage

Answer the following by appropriately matching the lists based on the information given in the paragraph. List-I includess starting materials and reagents of selected chemical reactions. List-II gives structures of compounds that may be formed as intermediate products and/or final products from the reactions of List-I.

Question 1:

Which of the following options has correct combination considering List-I and List-II?

Which of the following options has correct combination considering List-I and List-II?

The reaction sequence(s) that would lead to o-xylene as the major product is (are) [JEE(Advanced) 2021]

* Multiple Correct Options

Different possible thermal decomposition pathways for peroxyesters are shown below. Match each pathway from List-I with an appropriate structure from List-II.

List-I

List-II

(1)

C_{6} H_{5} CH_{2} CO_{3} CH_{3}

(2)

C_{6} H_{5} CO_{3} CH_{3}

(3)

C_{6} H_{5} CH_{2} CO_{3} C (CH_{3})_{2} CH_{2} C_{6} H_{5}

(4)

C_{6} H_{5} CO_{3} C (CH_{3})_{2} C_{6} H_{5}

JEE Advanced 2015

LEVELJEE Advanced

In the following reactions, the product S is -

Comprehension Passage

Treatment of compound

O

with

KMnO_{4} / H^{+}

gave

P

, which on heating with ammonia gave

Q

. The compound

Q

on treatment with

Br_{2} / NaOH

produced

R

. On strong heating,

Q

gave

S

, which on further treatment with ethyl 2-bromopropanoate in the presence of

KOH

followed by acidification, gave a compound

T

Question 1:

The compound $R$ is :

The compound $T$ is :

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.

List-I

List-II

Considering the following reaction sequence, the correct statement(s) is(are)

* Multiple Correct Options

(A)

Compounds P and Q are carboxylic acids.

(B)

Compound S decolorizes bromine water.

(C)

Compounds P and S react with hydroxylamine to give the corresponding oximes.

(D)

Compound R reacts with dialkylcadmium to give the corresponding tertiary alcohol.

JEE Advanced 2020

LEVELJEE Advanced

In the reaction scheme shown below Q, R and S are the major products. The correct structure of

* Multiple Correct Options

In the reaction given below, the total number of atoms having $s p^{2}$ hybridization in the major product P is ______.

JEE Advanced 2021

LEVELJEE Advanced

Comprehension Passage

For the following reaction scheme, percentage yields are given along the arrow :

x g

and

y g

are mass of

R

and

U

, respectively. (Use : Molar mass (in

g mol^{- 1}

) of

H

C

and

O

1

12

and

16

, respectively)

Question 1:

The value of x is______.

Question 2:

Micro-Topic Strategy Matrix

Nomenclature and Characterisation

Bond Fission, Electronic Displacement and Hyperconjugation

Types of Organic Reactions

Hydrocarbons

Haloalkanes & Haloarenes

Alcohols, Phenols, Ethers

Carbonyl Compounds

Amines

Biomolecules

Polymers

Chapter Elite-20 Challenge Zone

List-I

List-II

Comprehension Passage

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The volume of 1 M aqueous H2​SO4​ required to completely neutralize the ammonia evolved from 5.72 g of L in Kjeldahl's method of nitrogen estimation is ____ mL.

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } In sulphur estimation by Carius method, the amount of BaSO4​ formed from 3.79 g of M is ____ g.

The major products obtained from the reactions in List-II are the reactants for the named reactions mentioned in List-I. Match each entry in List-I with the appropriate entry in List-II and choose the correct options.

List-I

List-II

The reaction sequence given below is carried out with 16 moles of X. The yield of the major product in each step is given below the product in parentheses. The amount (in grams) of S produced is_______. Use: Atomic mass (in amu): H = 1, C = 12, O = 16, Br = 80

For the reaction sequence given below, the correct statement(s) is(are)

Monocyclic compounds P, Q, R and S are the major products formed in the reaction sequences given below. The product having the highest number of unsaturated carbon atom(s) is-

In the following reaction sequence Q, R, S and T are the major products. The correct statement(s) about Q, R, S and T is (are)

Match the major products obtained in the reactions given in List-I with the corresponding structures in List-II and choose the correct option.

List-I

List-II

Comprehension Passage

The number of heteroatoms present in one molecule of R is _____. [Use: Molar mass (in g mol^{-1}): H = 1, C = 12, N = 14, O = 16, Br = 80, Cl = 35.5 Atoms other than C and H are considered as heteroatoms]

The total number of carbon atoms and heteroatoms present in one molecule of S is _____. [Use: Molar mass in g mol^{-1}]: H = 1, C = 12, N = 14, O = 16, Br = 80, Cl = 35.5 Atoms other than C and H are considered as heteroatoms

Comprehension Passage

Which of the following options has correct combination considering List-I and List-II?

Which of the following options has correct combination considering List-I and List-II?

The reaction sequence(s) that would lead to o-xylene as the major product is (are) [JEE(Advanced) 2021]

Different possible thermal decomposition pathways for peroxyesters are shown below. Match each pathway from List-I with an appropriate structure from List-II.

List-I

List-II

In the following reactions, the product S is -

Comprehension Passage

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The compound R is :

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The compound T is :

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.

List-I

List-II

Considering the following reaction sequence, the correct statement(s) is(are)

In the reaction scheme shown below Q, R and S are the major products. The correct structure of

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } In the reaction given below, the total number of atoms having sp2 hybridization in the major product P is ______.

Comprehension Passage

The value of x is______.

The value of y is______.

The volume of 1 M aqueous $H_{2} SO_{4}$ required to completely neutralize the ammonia evolved from 5.72 g of L in Kjeldahl's method of nitrogen estimation is ____ mL.

In sulphur estimation by Carius method, the amount of $BaSO_{4}$ formed from 3.79 g of M is ____ g.

The compound $R$ is :

The compound $T$ is :

In the reaction given below, the total number of atoms having $s p^{2}$ hybridization in the major product P is ______.