JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 27 August 2021, Shift 2, Chemistry Q42

Question 42 of 90 in this shift, Chemistry question 12 of 30, Section A.

Which one of the following reactions will not yield propionic acid ?

(1) $\mathrm{CH_3CH_2CH_3 + KMnO_4(Heat), OH^{-}/H_3O^{+}}$
(2) $\mathrm{CH_3CH_2CCl_3 + OH^{-}/H_3O^{+}}$
(3) $\mathrm{CH_3CH_2COCH_3 + OI^{-}/H_3O^{+}}$
(4) $\mathrm{CH_3CH_2CH_2Br + Mg, CO_2}$ dry ether/ $\mathrm{H_3O^{+}}$ Official answer

Official answer

Option 4

NTA final key.

Chapter: Aldehydes, Ketones and Carboxylic Acids
Topic: Carboxylic Acids and Derivatives
Idea tested: Carboxylic Acid Synthesis via Grignard and CO2

Same idea in other shifts

Asked 4× in all

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.