Identify product $B$ in the following sequence of reaction:
Aniline $\xrightarrow[273 \ K]{NaNO_2+HCl} A$ $\xrightarrow[\Delta]{H_2O} B + N_2 \uparrow$

Which of the following compounds has the lowest solubility in water?

$4.7 \text{ g}$ of phenol is heated with $Zn$ to give product $X$. If this reaction goes to $60\%$ completion,then the number of moles of compound $X$ formed will be . . . . . . $\times 10^{-2}$. (Nearest Integer) (Given molar mass in $\text{g mol}^{-1}$: $H:1, C:12, O:16$)

The reaction is given as: $X \xrightarrow{Y} \text{Benzoquinone}$. Identify $X$ and $Y$ in the above reaction.

The order of boiling points for the given compounds is:

Benzoylation of phenol with benzoyl chloride in the presence of dilute $NaOH$ gives phenyl benzoate. This reaction is an example of