Answer:
Free radical polymerisation in
isoprene is initiated by a free radical attack.
\[\underset{\begin{smallmatrix}
\\
\text{(Free}\,\,\text{radical)}
\end{smallmatrix}}{\mathop{{{R}^{\centerdot
}}+C{{H}_{2}}=\underset{\begin{smallmatrix}
| \\
C{{H}_{3}}
\end{smallmatrix}}{\mathop{C}}\,-CH=C{{H}_{2}}}}\,\]
\[\underset{\begin{smallmatrix}
\\
\text{(Free}\,\,\text{radical)}
\end{smallmatrix}}{\mathop{\xrightarrow{\,}R+C{{H}_{2}}-\underset{\begin{smallmatrix}
| \\
C{{H}_{3}}
\end{smallmatrix}}{\mathop{C}}\,=CH-\overset{\centerdot
}{\mathop{C}}\,{{H}_{2}}}}\,\]
Free radicals participate in further
polymerisation. For details consult section 16.2.
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