Which of the following compounds has the lowest bond dissociation energy for a $C-H$ bond?

In chlorination of benzene,the reactive species is

In the following sequence of reactions,the maximum number of atoms present in molecule $C$ in one plane is:
$A$ $\xrightarrow[Cu \text{ tube}]{\text{Red hot}} B$ $\xrightarrow[\text{Anhydrous } AlCl_3]{CH_3Cl (1 \text{ eq})} C$
($A$ is the lowest molecular weight alkyne)

Product $(B)$ in this reaction is

Benzene reacts with $n-$propyl chloride in the presence of anhydrous $AlCl_3$ to give predominantly :

Benzene reacts with $CH_3Cl$ in the presence of anhydrous $AlCl_3$ to form