Learn

Friday, 9 October

JEE Main 2023 · ChemistryNumerical answerNumerical valueHardMulti-step

JEE Main 11 April 2023, Shift 1, Chemistry Q89

Question 89 of 90 in this shift, Chemistry question 29 of 30, Section B.

[figure: bicyclic (hydrindane-type) skeleton: cyclohexane fused to cyclopentane; Me at the ring-fusion carbon, adjacent cyclopentane carbon bearing OH] →HBr\xrightarrow{\mathrm{HBr}} 'A' (Major Product) The number of hyperconjugation structures involved to stablize carbocation formed in the above reaction is _____________.

The figure, in words

Fused 6-5 bicyclic alcohol: Me on ring-fusion carbon, OH on adjacent carbon of the five-membered ring, treated with HBr giving major product A.

Official answer

7

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
Resonance and Hyperconjugation
Idea tested
Counting Alpha-Hydrogens

Same topic in other shifts

All Resonance and Hyperconjugation questions
  1. 2 Apr 2026, Shift 2 · Q63Given below are two statements: Statement I: In…MediumSingle correct
  2. 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
  3. 6 Apr 2026, Shift 2 · Q63Shown below is the structure of methyl acetate with three different α\alpha, β\beta and γ\gamma carbon - oxygen bonds. The correct…MediumDiagram basedHas a figure
  4. 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
  5. 6 Apr 2024, Shift 2 · Q88Number of carbocations from the following that are not stabilized by hyperconjugation is ________.MediumNumerical valueHas a figure
  6. 9 Apr 2024, Shift 1 · Q71Relative stability of the contributing structures is : (I) CH2=CH−C∥O¨:−H\mathrm{CH_2=CH-\overset{\ddot{O}:}{\overset{\|}{C}}-H} ⟷\longleftrightarrow…MediumSingle correctHas 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 42 of the 174 JEE Main shifts held from 2017 to 2026.