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Saturday, 31 October

JEE Main 2026 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 6 April 2026, Shift 2, Chemistry Q65

Question 65 of 75 in this shift, Chemistry question 15 of 25, Section A.

An optically active alkyl bromide C4H9Br\mathrm{C_4H_9Br}, reacts with ethanolic KOH to form major compound [A] which reacts with bromine to give compound [B]. Compound [B] reacts with ethanolic KOH and sodamide to give compound [C]. One molecule of water adds to compound [C] on warming with mercuric sulphate and dilute sulphuric acid at 333 K to form compound [D]. The functional group in compound D will be confirmed by :
  1. (1)Haloform testOfficial answer
  2. (2)Lucas test
  3. (3)Silver mirror test
  4. (4)Benedict test

Official answer

Option 1

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
Alkenes and Alkynes
Idea tested
Kucherov Alkyne Hydration

Same idea in other shifts

Asked 4× in all
  1. 2 Apr 2025, Shift 1 · Q66An optically active alkyl halide C4H9Br\mathrm{C_4H_9Br} [A] reacts with hot KOH dissolved in ethanol and forms alkene [B] as major product…MediumSingle correct
  2. 24 Feb 2021, Shift 2 · Q44Which one of the following carbonyl compounds cannot be prepared by addition of water on an alkyne in the presence of HgSO4\mathrm{HgSO_4}…EasySingle correctHas a figure
  3. 9 Jan 2020, Shift 1 · Q43The major product (Y) in the following reactions is : CH3−CH(CH3)−C≡CH\mathrm{CH_3-CH(CH_3)-C{\equiv}CH}…MediumDiagram basedHas a figure

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.