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Saturday, 10 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 9 April 2024, Shift 2, Chemistry Q79

Question 79 of 90 in this shift, Chemistry question 19 of 30, Section A.

Major product of the following reaction is [figure: 4-cyanophenyl methyl ester, i.e. benzene ring with CN at one para position and CO2CH3\mathrm{CO_2CH_3} at the other] →(ii) H3O+(i) CH3MgBr (excess)\xrightarrow[\mathrm{(ii)\ H_3O^+}]{\mathrm{(i)\ CH_3MgBr\ (excess)}}

The figure, in words

Starting material: para-disubstituted benzene with CN on top and CO2CH3 at bottom. Reagents (i) CH3MgBr (excess), (ii) H3O+. Options are para-disubstituted benzenes as listed.
  1. (1)[figure: 4-cyanophenyl methyl ketone, NC−C6H4−C(=O)CH3\mathrm{NC-C_6H_4-C(=O)CH_3}]
  2. (2)[figure: NC−C6H4−C(CH3)2OH\mathrm{NC-C_6H_4-C(CH_3)_2OH}]
  3. (3)[figure: CH3O2C−C6H4−C(=O)CH3\mathrm{CH_3O_2C-C_6H_4-C(=O)CH_3}]
  4. (4)[figure: CH3C(=O)−C6H4−C(CH3)2OH\mathrm{CH_3C(=O)-C_6H_4-C(CH_3)_2OH}]Official answer

Official answer

Option 4

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Carboxylic Acids and Derivatives
Idea tested
Reaction of Esters with Grignard Reagents

Same idea in other shifts

Asked 2× in all
  1. 2 Apr 2017 (offline) · Q59The correct sequence of reagents for the following conversion will be : [reaction: 4-formylcyclohexanone (ring bearing C=O at the top and…HardSingle correctHas a figure

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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.