The following reaction is given:
$\xrightarrow{\text{Electrolysis}} A$
$A$ is

Two aromatic compounds $P$ and $Q$ give product $R.$ Reactant $P, Q$ and reagent used in the above reaction are

Complete the following reactions and identify $A, B, C$ respectively:
$(i)$ $\text{Phenol} + A \xrightarrow{\text{distill}} \text{Benzene}$
(ii) $\text{Benzenesulfonic acid} + B \xrightarrow{150-200^{\circ}C, \text{HCl, high pressure}} \text{Benzene}$
(iii) $\text{Chlorobenzene} \xrightarrow{C, \text{NaOH}} \text{Benzene}$

Which of the following is not an aromatic compound?

The major product $X$ is:

The electrophile required for the chlorination of benzene in the presence of $FeCl_3$ is.....