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Saturday, 31 October

JEE Main · Chemistry · Haloalkanes and Haloarenes

Alkane Synthesis via Grignard Protonation

JEE Main asked Alkane Synthesis via Grignard Protonation 3 times in 3 of the 108 shifts Lumi analysed, in 2021 and 2022. It belongs to Alkanes and Free Radicals, in Haloalkanes and Haloarenes (Chemistry). The longest wait between two years asking it was 1 year. In 2021 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
3
in 3 shifts
Years
2 of 8
First asked
2021
last in 2022
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

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

00.050.10’170’200.07’210.03’220’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 2 in 24 shifts · 2022: 1 in 24 shifts · 2023: 0 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
  • 20230 of 12
  • 20221 of 24
  • 20212 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.

  • Mass of alkane from grignard protonation
  • Product of aryl grignard with methanol

Difficulty

Easy 2Medium 1Hard 0

1 of the 3 questions had a numerical answer.

Every question

All 3 questions

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

  1. 26 Jul 2022, Shift 2 · Q89A 100 mL solution of CH3CH2MgBr\mathrm{CH_3CH_2MgBr} on treatment with methanol produces 2.24 mL of a gas at STP. The weight of gas produced is…EasyNumerical value
  2. 31 Aug 2021, Shift 2 · Q43For the following sequence of reactions, the correct products are : [benzene ring drawn with alternating double bonds] 1. Br2/Fe/Δ\Delta…MediumDiagram basedHas a figure
  3. 27 Aug 2021, Shift 1 · Q43In the following sequence of reactions the P is : [ring structure with Cl drawn] + Mg →etherdry\xrightarrow[\text{ether}]{\text{dry}} [ A ]…EasyDiagram basedHas a figure

Shifts: 27 Aug 2021, Shift 1, 31 Aug 2021, Shift 2, 26 Jul 2022, 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