$C_6H_6 + CH_3Cl \xrightarrow{anhydrous \ AlCl_3} C_6H_5CH_3 + HCl$ is an example of

Identify the product $A$ in the following reaction:
$C_6H_6 + CH_2Cl_2 \xrightarrow{\text{Anhy. } AlCl_3} A$

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

Identify the product $X$ in the following reaction:
$\text{Benzene} + Cl_{2(\text{excess})} \xrightarrow{AlCl_3, \Delta} X$

Nitration of benzene by nitric acid and sulphuric acid is

The following compound has four aromatic rings marked as $A$,$B$,$C$ and $D$. Rank them in terms of increasing reactivity towards electrophilic aromatic substitution?