Phenol can be distinguished from propanol by using the reagent

What is $Z$ in the following sequence of reactions?
$p-chloronitrobenzene$ $\xrightarrow{NaOH, 443 \ K} X$ $\xrightarrow{(i) Sn + HCl (ii) NaNO_2 / HCl, 0-5^{\circ}C} Y$ $\xrightarrow{H_3O^{+}, 10^{\circ}C} Z$

Identify $X$ and $Y$ in the following reaction:
$X \xrightarrow{Y} \text{Benzoquinone}$

Sodium phenoxide when heated with $CO_2$ under pressure at $125\,^{\circ}C$ yields a product which on acetylation produces $C$. The major product $C$ would be

Phenol reacts with bromine in carbon disulphide $(CS_2)$ at low temperature to give:

Identify the products $[A]$ and $[B]$,respectively in the following reaction: