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Friday, 9 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 25 July 2021, Shift 1, Chemistry Q45

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

[figure: phenol converted to 4-bromophenol (Major Product)] The given reaction can occur in the presence of : (a) Bromine water (b) Br2\mathrm{Br_2} in CS2\mathrm{CS_2}, 273 K (c) Br2/FeBr3\mathrm{Br_2/FeBr_3} (d) Br2\mathrm{Br_2} in CHCl3\mathrm{CHCl_3}, 273 K Choose the correct answer from the options given below :

The figure, in words

Phenol (OH on benzene ring) with arrow to para-bromophenol (OH at top, Br at bottom), labelled Major Product.
  1. (1)(a) and (c) only
  2. (2)(b) and (d) only
  3. (3)(b), (c) and (d) onlyOfficial answer
  4. (4)(a), (b) and (d) only

Official answer

Option 3

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
Alcohols and Phenols
Idea tested
Phenol Bromination Solvent Effect

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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.