Write the structures and names of the compounds formed when compound $A$ with molecular formula $C_7H_8$ is treated with $Cl_2$ in the presence of $FeCl_3$.

(N/A) The compound $A$ with molecular formula $C_7H_8$ is toluene $(C_6H_5CH_3)$.
When toluene is treated with $Cl_2$ in the presence of $FeCl_3$ (a Lewis acid),electrophilic aromatic substitution occurs.
The $-CH_3$ group is ortho and para-directing.
Therefore,the reaction yields a mixture of $o$-chlorotoluene and $p$-chlorotoluene.
The reaction is as follows:
$C_6H_5CH_3 + Cl_2 \xrightarrow{FeCl_3} \text{o-Chlorotoluene} + \text{p-Chlorotoluene}$