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Identify A, B and C in the following sequence of reactions:
\[
\begin{array}{l}
\mathrm{A}+\mathrm{CH}_{2}=\mathrm{CH}_{2} \longrightarrow \mathrm{B} \\
\mathrm{B}+\mathrm{nCH}_{2}=\mathrm{CH}_{2} \longrightarrow \mathrm{C} \\
\mathrm{C}+\mathrm{C} \longrightarrow \mathrm{C}_{6} \mathrm{H}_{5}-\left(\mathrm{CH}_{2}-\mathrm{CH}_{2}\right)_{\mathrm{n}}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{2} \\
\mathrm{CH}_{2}-\left(\mathrm{CH}_{2}-\mathrm{CH}_{2}\right)_{\mathrm{n}}-\mathrm{C}_{6} \mathrm{H}_{5}
\end{array}
\]
(a)
\[
\begin{array}{l}
\mathrm{A}=\dot{\mathrm{C}}_{6} \mathrm{H}_{5}, \mathrm{~B}=\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{2}-\dot{\mathrm{C}} \mathrm{H}_{2} \text { and } \\
\mathrm{C}=\mathrm{C}_{6} \mathrm{H}_{5}-\left(\mathrm{CH}_{2}-\mathrm{CH}_{2}\right)_{\mathrm{n}}-\mathrm{CH}_{2}-\dot{\mathrm{CH}_{2}}
\end{array}
\]
(b)
\[
\begin{array}{l}
\mathrm{A}=\mathrm{C}_{6} \mathrm{H}_{5} \dot{\mathrm{CO}}, \mathrm{B}=\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{2}-\dot{\mathrm{CH}_{2}} \text { and } \\
\mathrm{C}=\mathrm{C}_{6} \mathrm{H}_{5}-\left(\mathrm{CH}_{2}-\mathrm{CH}_{2}\right)_{\mathrm{n}}-\mathrm{CH}_{2}-\dot{\mathrm{C}} \mathrm{H}_{2}
\end{array}
\]
(c)
\[
\begin{array}{l}
\mathrm{A}=\dot{\mathrm{C}}_{6} \mathrm{H}_{5}, \mathrm{~B}=\mathrm{C}_{6} \mathrm{H}_{5}-(\dot{\mathrm{C}} \mathrm{H})-\mathrm{CH}_{3} \text { and } \\
\mathrm{C}=\mathrm{C}_{6} \mathrm{H}_{5}-\left(\mathrm{CH}_{2}-\mathrm{CH}_{2}\right)_{\mathrm{n}}-\mathrm{CH}_{2} \dot{\mathrm{CH}_{2}}
\end{array}
\]
(d)
\[
\begin{array}{l}
\mathrm{A}=\dot{\mathrm{C}}_{6} \mathrm{H}_{5}, \mathrm{~B}=\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{2}-\stackrel{\bullet}{\mathrm{C}} \mathrm{H}_{2} \\
\mathrm{C}=\mathrm{C}_{6} \mathrm{H}_{5}-\left(\mathrm{CH}_{2}-\mathrm{CH}_{2}\right)-\mathrm{C}_{6} \mathrm{H}_{5}
\end{array}
\]
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