The correct statement(s) about the following reaction sequence is(are) Cumene ( C_9H_ 12 ) [ ii) H_3O^+ ] i) O_2 P CHCl_3/NaOH Q ( major )+ R ( minor ) Q [ PhCH_2Br ] NaOH S

JEE Advanced 2016 Chemistry question

The correct statement(s) about the following reaction sequence is(are)

Cumene (\mathrm{})PQ\ (major)+R\ (minor)

(A)**R** is steam volatile
(B)**Q** gives dark violet coloration with 1% aqueous solutionCorrect
(C)**S** gives yellow precipitate with 2, 4-dinitrophenylhydrazineCorrect
(D)**S** gives dark violet coloration with 1% aqueous solution

Answer: (B),(C)

Solution

Cumene is oxidised to cumene hydroperoxide, which with acid gives phenol (P) and acetone. Reimer-Tiemann reaction of phenol () gives salicylaldehyde (o-hydroxybenzaldehyde, Q, major) and p-hydroxybenzaldehyde (R, minor). Q with NaOH forms the phenoxide, which reacts with

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Question ID VK-026514