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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceDiagram basedHardConceptual

JEE Main 27 January 2024, Shift 1, Chemistry Q76

Question 76 of 90 in this shift, Chemistry question 16 of 30, Section A.

Highest enol content will be shown by :

The figure, in words

Options are six-membered carbocyclic rings with C=O groups: (1) three adjacent C=O (1,2,3-trione); (2) two C=O at opposite positions (1,4-dione); (3) three C=O at alternate positions (1,3,5-trione); (4) two C=O at 1,3 positions (1,3-dione).
  1. (1)[figure: cyclohexane-1,2,3-trione]
  2. (2)[figure: cyclohexane-1,4-dione]
  3. (3)[figure: cyclohexane-1,3,5-trione]Official answer
  4. (4)[figure: cyclohexane-1,3-dione]

Official answer

Option 3

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Structural Isomerism
Idea tested
Aromaticity-Driven Enolization

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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. 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.