Carbonyl Compounds

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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 2026

LEVELJEE Advanced

The sum of total number of carbonyl groups (>C=O) present in the major products X and Y in the following reactions is _______.

JEE Advanced 2026

LEVELJEE Advanced

Natural rubber on complete ozonolysis (O $_{3}$ /Zn-H $_{2}$ O) gives compound \textbf{X} as the major product. \textbf{X} gives positive iodoform and Tollen's tests. \textbf{X} on heating with aqueous NaOH gives \textbf{Y} as the major product. \textbf{Y} is

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

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

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 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?

Comprehension Passage

Answer Q.13, Q.14 and Q.15 by appropriately matching the information given in the three columns of the following table. Columns 1, 2 and 3 contains starting materials, reaction conditions, and type of reactions, respectively. \begin{array}{|l|l|l|} \hline \textbf{Column-1} & \textbf{Column-2} & \textbf{Column-3} \\ \hline \text{(I) Toluene} & \text{(i) NaOH/Br}_2 & \text{(P) Condensation} \\ \text{(II) Acetophenone} & \text{(ii) Br}_2 / h\nu & \text{(Q) Carboxylation} \\ \text{(III) Banzaldehyde} & \text{(iii) (CH}_3\text{CO)}_2\text{O/CH}_3\text{COOK} & \text{(R) Substitution} \\ \text{(IV) Phenol} & \text{(iv) NaOH/CO}_2 & \text{(S) Haloform} \\ \hline \end{array}

Question 1:

For the synthesis of benzoic acid, the only CORRECT combination is

The only CORRECT combination in which the reaction proceeds through radical mechanism is

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 2014

LEVELJEE Advanced

The major product in the following reaction is

Reagent(s) which can be used to bring about the following transformation is(are)

* Multiple Correct Options

(A)

LiAlH

_{4}

in (C

_{2}

_{5}

)

_{2}

(B)

_{3}

in THF

(C)

NaBH

_{4}

in C

_{2}

_{5}

(D)

Raney Ni / H

_{2}

in THF

JEE Advanced 2023

LEVELJEE Advanced

In the following reactions, P, Q, R, and S are the major products.

* Multiple Correct Options

(A)

Both P and Q have asymmetric carbon(s).

(B)

Both Q and R have asymmetric carbon(s).

(C)

Both P and R have asymmetric carbon(s).

(D)

P has asymmetric carbon(s), S does not have any asymmetric carbon.

JEE Advanced 2023

LEVELJEE Advanced

Consider the following reaction scheme and choose the correct option(s) for the major products Q, R and S.

Choose the correct option(s) for the following reaction sequence Consider Q, R and S as major products

* Multiple Correct Options

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

The sum of total number of carbonyl groups (>C=O) present in the major products X and Y in the following reactions is _______.

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)

List-I

List-II

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

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?

Comprehension Passage

For the synthesis of benzoic acid, the only CORRECT combination is

The only CORRECT combination in which the reaction proceeds through radical mechanism is

The only CORRECT combination that gives two different carboxylic acids is

Comprehension Passage

The compound Y is :-

The compound Z is :-

In the following reactions, the product S is -

Among the following the number of reaction(s) that produce(s) benzaldehyde is –

The reaction(s) leading to the formation of 1,3,5-trimethylbenzene is (are)

The major product of the following reaction is -

Positive Tollen's test is observed for

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 ______.

The major product in the following reaction is

Reagent(s) which can be used to bring about the following transformation is(are)

In the following reactions, P, Q, R, and S are the major products.

Consider the following reaction scheme and choose the correct option(s) for the major products Q, R and S.

Choose the correct option(s) for the following reaction sequence Consider Q, R and S as major products

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