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Friday, 9 October

JEE Main 2024 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 8 April 2024, Shift 1, Chemistry Q89

Question 89 of 90 in this shift, Chemistry question 29 of 30, Section B.

Major product B of the following reaction has _________ π\pi-bond. [figure: ethylbenzene (C6H5CH2CH3\mathrm{C_6H_5CH_2CH_3})] →ΔKMnO4−KOH\xrightarrow[\Delta]{\mathrm{KMnO_4-KOH}} (A) →HNO3/H2SO4\xrightarrow{\mathrm{HNO_3/H_2SO_4}} (B)

The figure, in words

Ethylbenzene (benzene ring bearing CH2CH3) with reaction arrows: KMnO4-KOH, heat to A; then HNO3/H2SO4 to B.

Official answer

5

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Carboxylic Acids and Derivatives
Idea tested
Side-Chain Oxidation of Alkylbenzenes

Same idea in other shifts

Asked 3× in all
  1. 16 Mar 2021, Shift 2 · Q45[figure: 3-methylanisole (benzene ring with CH3 and OCH3 meta to each other) --"A"--> 3-methoxybenzoic acid (benzene ring with COOH and…EasyDiagram basedHas a figure
  2. 18 Mar 2021, Shift 1 · Q46[figure: p-methylanisole (benzene ring with CH3 at top and OCH3 at bottom, para) --(Alkaline KMnO4, then H+)--> "X"] Considering the above…EasyDiagram 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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.