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Saturday, 31 October

JEE Main · Chemistry · Hydrocarbons

Catalytic Isomerization of Alkanes

JEE Main asked Catalytic Isomerization of Alkanes 2 times in 2 of the 108 shifts Lumi analysed, in 2023 and 2026. It belongs to Alkanes and Free Radicals, in Hydrocarbons (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
2023
last in 2026
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

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

00.10.20’170’200’210’220.07’230’240’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 0 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: 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
  • 20220 of 24
  • 20210 of 24
  • 20200 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.

  • Identify compound from reforming products
  • Predict product of reaction

Difficulty

Easy 1Medium 1Hard 0

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. 2 Apr 2026, Shift 2 · Q64The compound (X) on heating in the presence of anhydrous AlCl3_3 and HCl gas gives 2,4-dimethyl pentane (ii) aromatization gives toluene…EasySingle correct
  2. 13 Apr 2023, Shift 1 · Q74In the following reaction 'X' is CH3(CH2)4CH3→ΔAnhy.AlCl3/HCl\mathrm{CH_3(CH_2)_4CH_3}\xrightarrow[\Delta]{\text{Anhy.AlCl}_3/\text{HCl}} 'X' (major product)MediumDiagram basedHas a figure

Shifts: 13 Apr 2023, Shift 1, 2 Apr 2026, Shift 2.

Same topic

Other ideas in Alkanes and Free Radicals

Alkanes and Free Radicals has 18 ideas JEE Main has asked; 11 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas