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Friday, 9 October

JEE Main 2025 · ChemistryMultiple choiceOtherMediumConceptual

JEE Main 4 April 2025, Shift 2, Chemistry Q63

Question 63 of 75 in this shift, Chemistry question 13 of 25, Section A.

In which pairs, the first ion is more stable than the second ? (A) [figure: 1-methoxycyclohexyl cation] & [figure: 1-methylcyclohexyl cation] (B) [figure: cyclohexyl carbanion (negative charge on the ring carbon) bearing an ortho-nitrophenyl group] & [figure: cyclohexyl carbocation (positive charge on the ring carbon) bearing an ortho-nitrophenyl group] (C) [figure: cyclohexylmethyl cation, CH2+\mathrm{CH_2^+} on a saturated cyclohexane ring] & [figure: CH2+\mathrm{CH_2^+} on a cyclohexene ring carbon that is part of the C=C (allylic cation)] (D) [figure: tert-butyl cation, Me3C+\mathrm{Me_3C^+}] & [figure: Me2C+(OMe)\mathrm{Me_2C^+(OMe)}]

The figure, in words

Four pairs of carbocations/ion structures (A)-(D) drawn in the stem.
  1. (1)(A) & (C) only
  2. (2)(B) & (C) only
  3. (3)(A) & (B) onlyOfficial answer
  4. (4)(B) & (D) only

Official answer

Option 3

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
Inductive and Electromeric Effects
Idea tested
Carbocation Stability

Same idea in other shifts

Asked 2× in all
  1. 30 Jan 2024, Shift 2 · Q73The correct stability order of carbocations isEasySingle correct

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.