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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 29 June 2022, Shift 1, Chemistry Q73

Question 73 of 90 in this shift, Chemistry question 13 of 30, Section A.

Two isomers 'A' and 'B' with molecular formula C4H8\mathrm{C_4H_8} give different products on oxidation with KMnO4\mathrm{KMnO_4} in acidic medium. Isomer 'A' on reaction with KMnO4/H+\mathrm{KMnO_4/H^+} results in effervescence of a gas and gives ketone. The compound 'A' is
  1. (1)But-1-ene.
  2. (2)cis-But-2-ene.
  3. (3)trans-But-2-ene.
  4. (4)2-methyl propene.Official answer

Official answer

Option 4

NTA final key (2022 Session 1).

Chapter
Hydrocarbons
Topic
Alkenes and Alkynes
Idea tested
Oxidative Cleavage with Hot KMnO4

Same idea in other shifts

Asked 2× in all
  1. 30 Jul 2022, Shift 2 · Q60Among the following, how many hydrocarbon (s) with formula C10 H16\mathrm{C_{10}\,H_{16}} which on reaction with acidic potassium permagenate…HardNumerical valueHas 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.