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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 29 July 2022, Shift 2, Chemistry Q73

Question 73 of 90 in this shift, Chemistry question 13 of 30, Section A.

Correct structure of γ\gamma-methylcyclohexane carbaldehyde is

The figure, in words

Four skeletal structures as options A-D: methylcyclohexane with CHO or CH2CHO side group, methyl at 1,3 (A, B) or 1,2 (C, D) position relative to the side group.
  1. (1)[figure: cyclohexane ring with a CHO group (C=O with H) on one ring carbon and a methyl group on the ring carbon two positions away (1,3-relationship)]Official answer
  2. (2)[figure: cyclohexane ring with a CH2\mathrm{CH_2}-CHO group on one ring carbon and a methyl group on the ring carbon two positions away (1,3-relationship)]
  3. (3)[figure: cyclohexane ring with a CHO group (C=O with H) on one ring carbon and a methyl group on the adjacent ring carbon (1,2-relationship)]
  4. (4)[figure: cyclohexane ring with a CH2\mathrm{CH_2}-CHO group on one ring carbon and a methyl group on the adjacent ring carbon (1,2-relationship)]

Official answer

Option 1

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

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.