b
(b)\(C{H_2} = CH - {(C{H_2})_5}COOH\mathop {\xrightarrow{{{\text{Peroxide}}}}}\limits_{HBr} \) \(\begin{array}{*{20}{c}}
{C{H_3} - CH - {{(C{H_2})}_5}COOH} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{Br\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}\)