Identify the initiation step $/ \mathrm{s}(\mathrm{X})$ and termination $\mathrm{step} /…
Identify the initiation step $/ \mathrm{s}(\mathrm{X})$ and termination $\mathrm{step} / \mathrm{s}(\mathrm{Y})$ of free radical chlorination of $\mathrm{CH}_4$ from the following.
a) $\dot{\mathrm{C}}_3+\dot{\mathrm{C}} \mathrm{l} \rightarrow \mathrm{CH}_3-\mathrm{Cl}$
b) $\dot{\mathrm{Cl}}+\dot{\mathrm{C}} l \rightarrow \mathrm{Cl}-\mathrm{Cl}$
c) $\dot{\mathrm{C}}_3+\mathrm{Cl}_2 \rightarrow \mathrm{CH}_3-\mathrm{Cl}+\dot{\mathrm{Cl}}$
d) $\mathrm{Cl}_2 \rightarrow 2 \dot{\mathrm{Cl}}$
e) $\mathrm{CH}_4+\dot{\mathrm{Cl}} \rightarrow \dot{\mathrm{C}} \mathrm{H}_3+\mathrm{HCl}$
f) $\mathrm{CH}_3+\dot{\mathrm{C}}_3 \rightarrow \mathrm{CH}_3-\mathrm{CH}_3$
$\begin{array}{cc}
\underline{X} & \underline{Y} \\
\text { c, d } & \text { a, b }
\end{array}$
$\begin{array}{cc}
\underline{X} & \underline{Y} \\
\text { b, d } & \text { a, c, e } \\
\end{array}$
$\begin{array}{cc}
\underline{X} & \underline{Y} \\
\text { d, e } & \text { b, c, f } \\
\end{array}$
$\begin{array}{cc}
\underline{X} & \underline{Y} \\
\text { d } & \text { a, b, f }
\end{array}$