JEE Main 2022ChemistryAldehydes and KetonesHardMCQ

JEE Main 2022 — Aldehydes and Ketones Question with Solution

JEE Main 2022 (25 Jul Shift 2)

Question

CH3-CH2-CN→EtherCH3MgBrA→H3O+B→HClZn-HgC. The correct structure of C is

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Correct answer
A

Step-by-step explanation

First, in this reaction the nitrile will react with the Grignard reagent. The reaction can be written as:

In this step, Mg Br gets attached to the nitrogen atom and alkyl anion attacks on the electrophilic carbon of the nitrile.This step leads to the formation of  imine.

Now, this reaction will further take place accordingly in the presence of aqueous acid. The reaction can be written as:

Clemmenson reagent acts only on aldehydes and ketones. Therefore, butan-2-one will get reduced to butane when we treat it with zinc and hydrochloric acid.

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About this question

This is a previous-year question from JEE Main 2022, covering the Aldehydes and Ketones 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.