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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 4 April 2024, Shift 2, Chemistry Q74

Question 74 of 90 in this shift, Chemistry question 14 of 30, Section A.

Correct order of stability of carbanion is -

The figure, in words

Four carbanions labelled a-d: (a) cyclopropene ring (triangle with one C=C double bond) bearing a negative charge on the sp3 carbon; (b) cyclobutyl anion (square with negative charge); (c) cyclopentyl anion (pentagon with negative charge); (d) cyclopentadienyl anion (five-membered ring with two C=C double bonds and a lone pair on the remaining carbon).
  1. (1)d > c > b > aOfficial answer
  2. (2)a > b > c > d
  3. (3)d > a > c > b
  4. (4)c > b > d > a

Official answer

Option 1

NTA final key.

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

Same idea in other shifts

Asked 3× in all
  1. 5 Apr 2026, Shift 1 · Q63Given below are two statements: Statement I: On the basis of inductive effect, the order of stability of alkyl carbanions is…EasyTwo statements
  2. 9 Jan 2020, Shift 1 · Q40The increasing order of basicity for the following intermediates is (from weak to strong)MediumDiagram 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.