Which of the following would produce an alcohol on treatment with $NaNO_2$ and $HCl$ in the presence of water?

Identify $X$ and $Y$ in the following reactions:

The increasing order of $pK_b$ values of the following compounds is

With respect to the following reaction,consider the given statements:
$C_6H_5NH_2 \xrightarrow{HNO_3, H_2SO_4, 288 \ K} \text{products}$
$(A)$ $o$-Nitroaniline and $p$-nitroaniline are the predominant products.
$(B)$ $p$-Nitroaniline and $m$-nitroaniline are the predominant products.
$(C)$ $HNO_3$ acts as an acid.
$(D)$ $H_2SO_4$ acts as an acid.

Give the major product of the following reaction $.$

Which among the following is the strongest Bronsted base?