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Saturday, 31 October

JEE Main · Chemistry · Haloalkanes and Haloarenes

SN1 Carbocation Intermediate

JEE Main asked SN1 Carbocation Intermediate 2 times in 2 of the 108 shifts Lumi analysed, in 2020 and 2023. It belongs to SN1 and SN2 Mechanisms, in Haloalkanes and Haloarenes (Chemistry). The longest wait between two years asking it was 3 years.

Updated 2026-10-24

Times asked
2
in 2 shifts
Years
2 of 8
First asked
2020
last in 2023
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020 and 2023. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.050.10’170.08’200’210’220.07’230’240’250’26

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

Shift by shift

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

  • 20260 of 9
  • 20250 of 8
  • 20240 of 18
  • 20231 of 12
  • 20220 of 24
  • 20210 of 24
  • 20201 of 12
  • 20170 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.

  • Most sn1 reactive halogen among structures
  • Characteristics of sn1 from mechanism

Difficulty

Easy 0Medium 1Hard 1

Every question was multiple choice.

Every question

All 2 questions

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

  1. 8 Apr 2023, Shift 1 · Q73Choose the halogen which is most reactive towards SN1\mathrm{S_N1} reaction in the given compounds (A, B, C & D) A. [structure] B.…HardDiagram basedHas a figure
  2. 3 Sep 2020, Shift 1 · Q44The mechanism of SN1\mathrm{S_N1} reaction is given as :…MediumOtherHas a figure

Shifts: 3 Sep 2020, Shift 1, 8 Apr 2023, 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