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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceDiagram basedEasyApplication

JEE Main 8 April 2024, Shift 1, Chemistry Q77

Question 77 of 90 in this shift, Chemistry question 17 of 30, Section A.

Which among the following compounds will undergo fastest SN2\mathrm{S_N2} reaction.

The figure, in words

Options are line-drawn cyclobutane derivatives with a bromoalkyl substituent.
  1. (1)[figure: cyclobutane ring with a methyl group and Br both on the same ring carbon]
  2. (2)[figure: cyclobutane ring bearing a C(CH3)2Br\mathrm{C(CH_3)_2Br} group]
  3. (3)[figure: cyclobutane ring bearing a CH2Br\mathrm{CH_2Br} group]Official answer
  4. (4)[figure: cyclobutane ring bearing a CH(CH3)Br\mathrm{CH(CH_3)Br} group]

Official answer

Option 3

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
SN1 and SN2 Mechanisms
Idea tested
Substrate Steric Effects

Same idea in other shifts

Asked 3× in all
  1. 10 Apr 2023, Shift 1 · Q73Identify the correct order of reactivity for the following pairs towards the respective mechanism (A) SN2\mathrm{S_N2} [structure:…MediumOtherHas a figure
  2. 4 Sep 2020, Shift 1 · Q41The decreasing order of reactivity of the following organic molecules towards AgNO3\mathrm{AgNO_3} solution is :HardDiagram 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.