What is the number of monosubstituted products possible for benzene?

The ratio of $\sigma$ and $\pi$ bonds in benzene is:

Which of the following is a carcinogen?

Product $(A)$ is

Identify the correct statement regarding the products $A$ and $B$ formed in the following reactions of benzene:
$1$. Benzene + $6Cl_2$ $\xrightarrow{AlCl_3 \text{ (excess)}}$ $A$
$2$. Benzene + $Cl_2$ (excess) $\xrightarrow{h\nu, 500 \ K}$ $B$

In which of the following compounds does the $C-H$ bond exhibit the lowest bond dissociation energy?