Chemistry · Aldehydes and Ketones

JEE Main 2025 — 4 April, Morning Shift — Question 2

An organic compound ( $X$ ) with molecular formula $\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}$ is not readily oxidised. On reduction it gives $\mathrm{C}_{3} \mathrm{H}_{8} \mathrm{O}(\mathrm{Y})$ which reacts with HBr to give a bromide $(Z)$ which is converted to Grignard reagent. This Grignard reagent on reaction with ( X ) followed by hydrolysis give 2, 3-dimethylbutan-2-ol. Compounds ( X ), ( Y ) and ( Z ) respectively are

Option A:
$\mathrm{CH}_{3} \mathrm{COCH}_{3}, \mathrm{CH}_{3} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{3}, \mathrm{CH}_{3} \mathrm{CH}(\mathrm{Br}) \mathrm{CH}_{3}$
Correct
Option B:
$\mathrm{CH}_{3} \mathrm{COCH}_{3}, \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}, \mathrm{CH}_{3} \mathrm{CH}(\mathrm{Br}) \mathrm{CH}_{3}$
Option C:
$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHO}, \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}, \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br}$
Option D:
$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHO}, \mathrm{CH}_{3} \mathrm{CH}=\mathrm{CH}_{2}, \mathrm{CH}_{3} \mathrm{CH}(\mathrm{Br}) \mathrm{CH}_{3}$

Answer: A

Step-by-step solution

$\mathrm{X} \Rightarrow \mathrm{CH}_{3}-\mathrm{C}-\mathrm{CH}_{3}$ as the organic compound is not readily oxidised.

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Exam: JEE Main 2025
Paper: 4 April, Morning Shift
Subject: Chemistry
Chapter: Aldehydes and Ketones
Topic: Important Aldehydes and Ketones + Misc

Given below are two statements, one is labelled as Statement I and the other is labelled as Statement II. Statement I: The dipole moment of…

Answer: A

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