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Saturday, 31 October

JEE Main · Chemistry · Hydrocarbons

Carbocation Rearrangements

JEE Main asked Carbocation Rearrangements 5 times in 4 of the 108 shifts Lumi analysed, in 2020, 2021 and 2023. It belongs to Alkenes and Alkynes, in Hydrocarbons (Chemistry). The longest wait between two years asking it was 2 years. In 2021 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
5
in 4 shifts
Years
3 of 8
First asked
2020
last in 2023
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021 and 2023. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.050.10’170.08’200.10’210’220.07’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 3 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
  • 202122 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: application.

  • Predict product of reaction
  • Hi addition with carbocation rearrangement

Difficulty

Easy 0Medium 3Hard 2

Every question was multiple choice.

Every question

All 5 questions

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

  1. 6 Apr 2023, Shift 2 · Q75In the following reaction, 'B' isHardDiagram basedHas a figure
  2. 17 Mar 2021, Shift 1 · Q43[reaction drawn: see figure_note] Product “A” in the above chemical reaction is :MediumDiagram basedHas a figure
  3. 24 Feb 2021, Shift 1 · Q41What is the major product formed by HI on reaction with [figure] ?MediumDiagram basedHas a figure
  4. 24 Feb 2021, Shift 1 · Q44What is the final product (major) ‘A’ in the given reaction ? [figure] →HCl\xrightarrow{\mathrm{HCl}} ‘A’ (major product)MediumDiagram basedHas a figure
  5. 2 Sep 2020, Shift 1 · Q41The major product in the following reaction is : 1-methyl-1-vinylcyclopentane (H3C\mathrm{H_3C} and CH=CH2\mathrm{CH=CH_2} on the same ring…HardDiagram basedHas a figure

Shifts: 2 Sep 2020, Shift 1, 24 Feb 2021, Shift 1, 17 Mar 2021, Shift 1, 6 Apr 2023, Shift 2.

Same topic

Other ideas in Alkenes and Alkynes

Alkenes and Alkynes has 24 ideas JEE Main has asked; 14 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas