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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceDiagram basedMediumMulti-step

JEE Main 29 January 2024, Shift 1, Chemistry Q77

Question 77 of 90 in this shift, Chemistry question 17 of 30, Section A.

The major product (P) in the following reaction is

The figure, in words

Reaction scheme: benzene ring with OCH2CH3 and CH=CH2 substituents at meta positions, treated with conc. HBr (excess), heat, giving (P) major product.
  1. (1)[figure: benzene ring with Br and CH2CH2Br\mathrm{CH_2CH_2Br} at meta positions]
  2. (2)[figure: benzene ring with OH and CH2CH2Br\mathrm{CH_2CH_2Br} at meta positions]
  3. (3)[figure: benzene ring with OH and CH(Br)CH3\mathrm{CH(Br)CH_3} at meta positions]Official answer
  4. (4)[figure: benzene ring with Br and CH(Br)CH3\mathrm{CH(Br)CH_3} at meta positions]

Official answer

Option 3

NTA final key.

Chapter
Alcohols, Phenols and Ethers
Topic
Ethers
Idea tested
Cleavage of Alkyl-Aryl Ethers

Same idea in other shifts

Asked 3× in all
  1. 28 Jul 2022, Shift 2 · Q44Compound I is heated with Conc. HI to give a hydroxy compound A which is further heated with Zn dust to give compound B. Identify A and B.…EasyDiagram basedHas a figure
  2. 18 Mar 2021, Shift 2 · Q44Main Products formed during a reaction of 1-methoxy naphthalene with hydroiodic acid are :EasySingle correctHas 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 108 of the 174 JEE Main shifts held from 2017 to 2026.