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Saturday, 31 October

JEE Main · Chemistry · Haloalkanes and Haloarenes

Allylic and Benzylic Reactivity in SN1

JEE Main asked Allylic and Benzylic Reactivity in SN1 7 times in 7 of the 108 shifts Lumi analysed, in 2017, 2021, 2022, 2023 and 2026. It belongs to SN1 and SN2 Mechanisms, in Haloalkanes and Haloarenes (Chemistry). The longest wait between two years asking it was 4 years, across 2018 and 2019, which Lumi has no shifts for. In 2021 and 2022 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
7
in 7 shifts
Years
5 of 8
First asked
2017
last in 2026
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2017, 2021, 2022, 2023 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.510.83’170’200.07’210.07’220.07’230’240’250.11’26

Raw count: 2017: 1 in 1 shift · 2020: 0 in 12 shifts · 2021: 2 in 24 shifts · 2022: 2 in 24 shifts · 2023: 1 in 12 shifts · 2024: 0 in 18 shifts · 2025: 0 in 8 shifts · 2026: 1 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20261 of 9
  • 20250 of 8
  • 20240 of 18
  • 20231 of 12
  • 20222 of 24
  • 20212 of 24
  • 20200 of 12
  • 20171 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Diagram based is the usual form. Skill tested: conceptual.

  • Statement i/ii on sn1 reactivity
  • Order/ranking of reactivity toward sn1

Difficulty

Easy 1Medium 4Hard 2

1 of the 7 questions had a numerical answer.

Every question

All 7 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 2 Apr 2026, Shift 1 · Q64Given below are two statements : Statement (I) : Benzyl chloride reacts faster in SN1\mathrm{S_N1} mechanism than ethyl chloride. Statement…EasyTwo statements
  2. 11 Apr 2023, Shift 1 · Q74[figure: Reaction (I): 4-methoxybenzyl chloride (MeO−C6H4−CH2Cl\mathrm{MeO{-}C_6H_4{-}CH_2Cl}) + Nu gives 4-methoxybenzyl-Nu. Reaction (II):…MediumDiagram basedHas a figure
  3. 29 Jun 2022, Shift 2 · Q75Two isomers (A) and (B) with Molar mass 184 g/mol and elemental composition C, 52.2% ; H, 4.9 % and Br 42.9%, respectively on oxidation…HardDiagram basedHas a figure
  4. 24 Jun 2022, Shift 2 · Q89Consider the above reaction. The number of π\pi electrons present in the product 'P' is ________.MediumNumerical valueHas a figure
  5. 31 Aug 2021, Shift 1 · Q45The correct order of reactivity of the given chlorides with acetate in acetic acid is :HardDiagram basedHas a figure
  6. 3 Aug 2021, Shift 2 · Q45Arrange the following halides in the increasing order of their reactivity towards SN1\mathrm{S_N1} reaction mechanism.MediumSingle correctHas a figure
  7. 2 Apr 2017 (offline) · Q55The increasing order of the reactivity of the following halides for the SN1\mathrm{S_N1} reaction is : CH3CHCH2CH3\mathrm{CH_3CHCH_2CH_3} with Cl on…MediumOtherHas a figure

Shifts: 2 Apr 2017 (offline), 3 Aug 2021, Shift 2, 31 Aug 2021, Shift 1, 24 Jun 2022, Shift 2, 29 Jun 2022, Shift 2, 11 Apr 2023, Shift 1, 2 Apr 2026, Shift 1.

Same topic

Other ideas in SN1 and SN2 Mechanisms

SN1 and SN2 Mechanisms has 19 ideas JEE Main has asked; 12 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas