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Saturday, 31 October

JEE Main 2022 · ChemistryNumerical answerNumerical valueHardMulti-step

JEE Main 30 July 2022, Shift 2, Chemistry Q60

Question 60 of 90 in this shift, Chemistry question 30 of 30, Section B.

Among the following, how many hydrocarbon (s) with formula C10 H16\mathrm{C_{10}\,H_{16}} which on reaction with acidic potassium permagenate yield(s) same product ? ________ [figure: five skeletal drawings separated by commas: (1) six-membered ring with a short line at the top and, at the bottom, a line bearing a double bond and a short line; (2) a chain with a double bond at its upper end and a short line, joined to a four-membered ring with one double bond (inner line on the right side) and a short line at the lower left; (3) five-membered ring with one double bond near the top right, a short line at the top and a short line at the right, and a chain from the lower right ending in a double bond; (4) like (2) but the four-membered ring has its double bond on the bottom edge; (5) a chain with a double bond at its upper end, joined to a three-membered ring with a double bond line along its bottom edge]

The figure, in words

Five skeletal hydrocarbon drawings (rings of 6, 4, 5, 4, 3 members with chains/double bonds as described in the stem); no atom labels printed.

Official answer

2

NTA final key.

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

Same idea in other shifts

Asked 2× in all
  1. 29 Jun 2022, Shift 1 · Q73Two isomers 'A' and 'B' with molecular formula C4H8\mathrm{C_4H_8} give different products on oxidation with KMnO4\mathrm{KMnO_4} in acidic…MediumSingle correct

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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.