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Friday, 9 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedEasyApplication

JEE Main 16 March 2021, Shift 2, Chemistry Q45

Question 45 of 90 in this shift, Chemistry question 15 of 30, Section A.

[figure: 3-methylanisole (benzene ring with CH3 and OCH3 meta to each other) --"A"--> 3-methoxybenzoic acid (benzene ring with COOH and OCH3 meta to each other)] In the above reaction, the reagent "A" is :

The figure, in words

Reaction: benzene ring bearing CH3 and OCH3 (meta) converted by reagent A to the ring bearing COOH and OCH3 (meta).
  1. (1)LiAlH4\mathrm{LiAlH_4}
  2. (2)Alkaline KMnO4\mathrm{KMnO_4}, H+\mathrm{H^+}Official answer
  3. (3)HCl, Zn-Hg
  4. (4)NaBH4\mathrm{NaBH_4}, H3O+\mathrm{H_3O^+}

Official answer

Option 2

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. 8 Apr 2024, Shift 1 · Q89Major product B of the following reaction has _________ π\pi-bond. [figure: ethylbenzene (C6H5CH2CH3\mathrm{C_6H_5CH_2CH_3})]…MediumNumerical valueHas 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.