The correct statement(s) about the following reaction sequence is (are)
Cumene `(C_(9)H_(12))underset((ii)H_(3)O^(+))overset((i)O_(2))rarrPoverset(CHCl_(3)//NaOH)rarr`
Q(major)+R(minor), `Q underset(PhCH_(2)Br)overset(NaOH)rarrS`

Options

A. R is steam volatile
B. Q gives dark violet colouration with 1% aqueous `FeCl_(3)` solution
C. S gives yellow precipitate with 2,4-dinitro phenylhydrazine
D. S gives dark violet colouration with 1% aqueous `FeCl_(3)` solution

Answer

B, C

Explanation

(Q) forms intramolecular hydrogen bonding `(R)` forms intermolecular hydrogen bonding. Therefore, (Q) has low boiling point and is steam volatile while `(R)` has high boiling point and is not steam volatile.

(Q) gives dark violet colouration with 1% aqueous `FeCl_(3)` solution because it has phenolic (-OH) group. (S) gives yellow ppt. with 2, 4-dinitrophenyl hydrazine because it has carbonyl (-CHO) group but does not give violet colouration with 1% aqueous `FeCl_(3)` because it does not have -OH group.