Question

The correct statement about the following reaction sequence is(are)
Cumene `(C_9H_12)underset((ii)H_3O^+)overset((i)O_2)to P overset(CHCl_3//NaOH)to Q"(major)" + "R (min or )" Q underset(PhCH_2Br)overset(NaOH)to S `
A. R is steam volatile
B. Q gives dark violet coloration with 1% aqueous `FeCl_3` solution
C. S gives yellow precipitate with 2,4-dinitrophenylhydrazine
D. S gives dark violet colouration with 1% aqueous `FeCl_3` solution

Answer 1

Correct Answer - B::C

Q (not R) is steam volatile due to intramolecular hydrogen bonding
Q gives violet colouration due to phenolic functional group
S gives yellow precipitate due to aldehydic group with 2,4-DNP
S does not have free phenolic group to respond to `FeCl_3` test.