JEE Main 2022ChemistryCarboxylic Acid DerivativesHardMCQ

JEE Main 2022 — Carboxylic Acid Derivatives Question with Solution

JEE Main 2022 (29 Jun Shift 2)

Question

Two isomers A and B with Molar mass 184 g/mol and elemental compositio C, 52.2%; H, 49% and Br 42.9% gave benzoic acid and p- bromobenzoic acid, respectively on oxidation with KMnO4. Isomer 'A' is optically active and gives a pale yellow precipitate when warmed with alcoholic AgNO3. Isomer 'A' and 'B' are, respectively :

Choose an option

Show full solutionCorrect option: C
Correct answer
C

H3C-CHBr-C6H5 and 

 

Step-by-step explanation

Based on the percentage composition of the elements given the molecular formula of the compound is C8H9Br

And the degree of unsaturation or double bond equivalent of  C8H9Br is 4.

It is mentioned that A is optically active and gives pale yellow precipitate with AgNO3.

Hence, the structures of A and B can be deduced based on the following reactions.

 

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About this question

This is a previous-year question from JEE Main 2022, covering the Carboxylic Acid Derivatives chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.