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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceDiagram basedEasyApplication

JEE Main 30 January 2024, Shift 2, Chemistry Q78

Question 78 of 90 in this shift, Chemistry question 18 of 30, Section A.

m-chlorobenzaldehyde on treatment with 50% KOH solution yields

The figure, in words

All four options are structures of products.
  1. (1)[figure: 3,3'-dichlorobenzoin, Cl-C6H4-CH(OH)-C(=O)-C6H4-Cl with Cl meta on both rings]
  2. (2)[figure: two molecules of m-hydroxybenzaldehyde, HO-C6H4-CHO (OH meta) + HO-C6H4-CHO]
  3. (3)[figure: m-chlorobenzoate anion, Cl-C6H4-COO^- (meta) + m-chlorobenzyl alcohol, Cl-C6H4-CH2OH (meta)]Official answer
  4. (4)[figure: m-hydroxybenzoate anion, HO-C6H4-COO^- (meta) + m-hydroxybenzyl alcohol, HO-C6H4-CH2OH (meta)]

Official answer

Option 3

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Aldol and Cannizzaro
Idea tested
Cannizzaro Reaction

Same idea in other shifts

Asked 5× in all
  1. 28 Jun 2022, Shift 1 · Q74The correct structure of product ‘A’ formed in the following reaction,…MediumDiagram basedHas a figure
  2. 4 Aug 2021, Shift 2 · Q45Cannizzaro reaction cannot be given byEasyOtherHas a figure
  3. 31 Aug 2021, Shift 2 · Q44For the reaction given below : [benzene ring drawn with an inner circle; CHO attached at top, CH2OH\mathrm{CH_2OH} attached at bottom] 1.…MediumDiagram basedHas a figure
  4. 3 Sep 2020, Shift 2 · Q44The compound A in the following reactions is : A…HardDiagram basedHas 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 108 of the 174 JEE Main shifts held from 2017 to 2026.