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Friday, 9 October

JEE Main 2024 · ChemistryNumerical answerNumerical valueMediumApplication

JEE Main 6 April 2024, Shift 2, Chemistry Q88

Question 88 of 90 in this shift, Chemistry question 28 of 30, Section B.

Number of carbocations from the following that are not stabilized by hyperconjugation is ________.

The figure, in words

Seven carbocations drawn: a skeletal secondary cation with a branched alkyl chain; a cation drawn with a circled plus labelled (tert.-Butyl) (tert.-Butyl); +CH3; a cyclopentadienyl cation (five-membered ring with two double bonds, + on ring carbon); +CH2-OCH3; a skeletal tert-butyl type cation; and (CH3)2N-CH2+ (N with two methyl lines and CH2+).

Official answer

5

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
Resonance and Hyperconjugation
Idea tested
Hyperconjugation

Same idea in other shifts

Asked 3× in all
  1. 5 Apr 2026, Shift 2 · Q63IUPAC name of the some alkenes are given below. Find out the correct stability order. A. 2-Methylbut-2-ene B. ciscis-But-2-ene C. 2,…MediumSingle correct
  2. 3 Apr 2025, Shift 2 · Q65Given below are two statements: Statement I : Hyperconjugation is not a permanent effect. Statement II : In general, greater the number of…EasyTwo statements

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.