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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 28 June 2022, Shift 2, Chemistry Q75

Question 75 of 90 in this shift, Chemistry question 15 of 30, Section A.

A →(ii) CN−; (iii) H2O/H+(i) Cl2, Δ\xrightarrow[\text{(ii) CN}^-\text{; (iii) H}_2\text{O/H}^+]{\text{(i) Cl}_2,\ \Delta} 4-Bromophenyl acetic acid. In the above reaction ‘A’ is

The figure, in words

Reaction scheme: A with reagents (i) Cl2, heat (ii) CN- (iii) H2O/H+ gives 4-Bromophenyl acetic acid. Options are para-substituted benzene rings drawn as described.
  1. (1)[figure: benzene ring with Br at the top and CH2CH3\mathrm{CH_2CH_3} at the bottom (para)]
  2. (2)[figure: benzene ring with a single Br substituent]
  3. (3)[figure: benzene ring with CH3\mathrm{CH_3} at the top right and Br at the bottom left (para)]Official answer
  4. (4)[figure: benzene ring with CH=CH2\mathrm{CH=CH_2} at the top right and Br at the bottom left (para)]

Official answer

Option 3

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
Alkanes and Free Radicals
Idea tested
Halogenation Chain Mechanism

Same idea in other shifts

Asked 3× in all
  1. 8 Apr 2026, Shift 2 · Q65n-Butane on monochlorination under photochemical condition gives an optically active compound "P". "P" on further chlorination gives…MediumSingle correct
  2. 6 Apr 2023, Shift 1 · Q89Number of bromo derivatives obtained on treating ethane with excess of Br2\mathrm{Br_2} in diffused sunlight is ________HardNumerical value

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.