Give the mechanism of chlorination of methane.

(N/A) The mechanism involves a chain reaction known as free radical substitution.
$1)$. Chain initiation: The reaction is initiated by $UV$ light,which breaks a chlorine molecule into two chlorine free radicals: $Cl_2 \xrightarrow{h\nu} 2Cl \cdot$
$2)$. Chain propagation: These steps keep the reaction going.
Step $A$: $CH_4 + Cl \cdot \rightarrow \cdot CH_3 + HCl$
Step $B$: $\cdot CH_3 + Cl_2 \rightarrow CH_3Cl + Cl \cdot$
$3)$. Chain termination: These reactions remove free radicals from the system.
$2Cl \cdot \rightarrow Cl_2$
$\cdot CH_3 + Cl \cdot \rightarrow CH_3Cl$
$\cdot CH_3 + \cdot CH_3 \rightarrow CH_3-CH_3$