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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 27 January 2024, Shift 1, Chemistry Q73

Question 73 of 90 in this shift, Chemistry question 13 of 30, Section A.

The correct statement regarding nucleophilic substitution reaction in a chiral alkyl halide is :
  1. (1)Racemisation occurs in both SN1\mathrm{S_N1} and SN2\mathrm{S_N2} reactions.
  2. (2)Retention occurs in SN1\mathrm{S_N1} reaction and inversion occurs in SN2\mathrm{S_N2} reaction.
  3. (3)Racemisation occurs in SN1\mathrm{S_N1} reaction and retention occurs in SN2\mathrm{S_N2} reaction.
  4. (4)Racemisation occurs in SN1\mathrm{S_N1} reaction and inversion occurs in SN2\mathrm{S_N2} reaction.Official answer

Official answer

Option 4

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
SN1 and SN2 Mechanisms
Idea tested
SN2 Transition State

Same idea in other shifts

Asked 4× in all
  1. 8 Apr 2024, Shift 2 · Q75Given below are two statements : Statement (I) : SN2\mathrm{S_N2} reactions are 'stereospecific', indicating that they result in the…EasyTwo statements
  2. 25 Jul 2022, Shift 1 · Q74Most stable product of the following reaction is : (i) p-toluenesulfonyl chloride (H3C−C6H4−SO2Cl\mathrm{H_3C{-}C_6H_4{-}SO_2Cl}), Pyridine (ii) NaCN,…MediumDiagram basedHas a figure
  3. 27 Jun 2022, Shift 1 · Q75The major product of the following reaction is : [figure: reactant drawn as a benzene ring with a substituent F ortho to a side chain and…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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.