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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceOtherEasyApplication

JEE Main 4 August 2021, Shift 2, Chemistry Q45

Question 45 of 90 in this shift, Chemistry question 15 of 30, Section A.

Cannizzaro reaction cannot be given by

The figure, in words

Options 2-4 are drawn rings with a CHO substituent, as described in the options.
  1. (1)CCl3 CHO\mathrm{CCl_3\ CHO}
  2. (2)[benzene ring (circle drawn inside) with CHO attached]
  3. (3)[six-membered ring with one C=C double bond, CHO attached to a carbon of the double bond]
  4. (4)[six-membered ring (no double bonds) with CHO attached]Official answer

Official answer

Option 4

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. 30 Jan 2024, Shift 2 · Q78m-chlorobenzaldehyde on treatment with 50% KOH solution yieldsEasyDiagram basedHas a figure
  2. 28 Jun 2022, Shift 1 · Q74The correct structure of product ‘A’ formed in the following reaction,…MediumDiagram basedHas 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.