JEE Main 2022 · 28 Jul · Shift 1 · Chemistry Q75

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ChemistrySingle correct+4 / -1Question 75 of 90

Identify the major products A and B for the below given reaction sequence.

Benzene → (1) CH3CHClCH3, AlCl3 (2) O2 (3) H⁺, H2O → P; P with Na2Cr2O7/H2SO4 gives A; P with Br2 in CS2 gives B.

A: phenol; B: 4-bromophenol

A: 1,4-benzoquinone; B: 4-bromophenol

A: 1,4-benzoquinone; B: 2,4,6-tribromophenol

1,4-Benzoquinone and 2,4,6-tribromophenol.

A: phenol; B: 2,4,6-tribromophenol

Answer and worked solution

Official answer: B

P is phenol (cumene process). Dichromate oxidises it to A, 1,4-benzoquinone. $\mathrm{Br_2}$ in $\mathrm{CS_2}$ (non-polar, low temperature) gives B, 4-bromophenol.

(B)

Topics:Phenols

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JEE Main 2022 · 28 Jul · Shift 1, Chemistry question 75