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Friday, 9 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 28 July 2022, Shift 1, Chemistry Q75

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

Identify the major products A and B for the below given reaction sequence. Benzene →(1) CH3CHClCH3, AlCl3; (2) O2; (3) H⊕, H2O\xrightarrow{\text{(1) }\mathrm{CH_3CHClCH_3,\ AlCl_3};\ \text{(2) }\mathrm{O_2};\ \text{(3) }\mathrm{H^{\oplus},\ H_2O}} P; P →Na2Cr2O7/H2SO4\xrightarrow{\mathrm{Na_2Cr_2O_7/H_2SO_4}} A; P →Br2 in CS2\xrightarrow{\mathrm{Br_2\ in\ CS_2}} B

The figure, in words

Reaction scheme: benzene to P via (1) isopropyl chloride, AlCl3 (2) O2 (3) H+, H2O; P to A with Na2Cr2O7/H2SO4; P to B with Br2 in CS2. Options give structures of A and B.
  1. (1)[figure: A = phenol; B = 4-bromophenol (p-bromophenol)]
  2. (2)[figure: A = p-benzoquinone; B = 4-bromophenol (p-bromophenol)]Official answer
  3. (3)[figure: A = p-benzoquinone; B = 2,4,6-tribromophenol]
  4. (4)[figure: A = phenol; B = 2,4,6-tribromophenol]

Official answer

Option 2

NTA final key (2022 Session 2).

Chapter
Alcohols, Phenols and Ethers
Topic
Alcohols and Phenols
Idea tested
Oxidation of Phenol to Benzoquinone

Same topic in other shifts

All Alcohols and Phenols questions
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  6. 3 Apr 2025, Shift 1 · Q68Number of molecules from below which cannot give iodoform reaction is: Ethanol, Isopropyl alcohol, Bromoacetone, 2−-Butanol,…MediumSingle correct

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.