Heating benzoic acid with $X$ and phenol with $Y$ gives benzene. $X$ and $Y$ are respectively:

The major product of the following reaction is:

The unknown product $(A)$ in the following reaction is:
Salicylic acid + $2I-Cl \rightarrow (A)$

The order of boiling points for the given compounds is:

What are $A, B, C$ and $D$ in the following reactions?
$i)$ Aniline $\xrightarrow[273 \ K]{NaNO_2 \mid HCl} A$ $\xrightarrow{B} \text{Phenol}$
$ii)$ Cumene $\xrightarrow{O_2} C$ $\xrightarrow{D} \text{Phenol} + \text{acetone}$

Phenol is