Learn

Friday, 9 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedEasyApplication

JEE Main 18 March 2021, Shift 1, Chemistry Q46

Question 46 of 90 in this shift, Chemistry question 16 of 30, Section A.

[figure: p-methylanisole (benzene ring with CH3 at top and OCH3 at bottom, para) --(Alkaline KMnO4, then H+)--> "X"] Considering the above chemical reaction, identify the product "X" :

The figure, in words

Reactant: benzene ring with CH3 (top) and OCH3 (bottom), para; reagent alkaline KMnO4 then H+. Options are para-substituted benzene structures.
  1. (1)X - 4-methoxybenzyl alcohol (pp-CH3O−C6H4−CH2OH\mathrm{CH_3O{-}C_6H_4{-}CH_2OH})
  2. (2)X - 4-methoxybenzoic acid (pp-CH3O−C6H4−COOH\mathrm{CH_3O{-}C_6H_4{-}COOH})Official answer
  3. (3)X - 4-methoxybenzaldehyde (pp-CH3O−C6H4−CHO\mathrm{CH_3O{-}C_6H_4{-}CHO})
  4. (4)X - 4-methylphenol (pp-CH3−C6H4−OH\mathrm{CH_3{-}C_6H_4{-}OH})

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. 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

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.