$\begin{array}{*{20}{c}} {C{H_3}\,\,\,} \\ {|\,\,\,\,\,\,\,\,} \\ {C{H_3} - C - CHC{H_3}} \\ {\,|\,\,\,\,\,\,\,\,\,\,|} \\ {\,\,H\,\,\,\,\,\,\,Br} \end{array}$ $\xrightarrow{{C{H_3}OH}}$
${CH}_{4}+{I}_{2} \underset{\text { Reversible }}{\stackrel{{hv}}{\longrightarrow}} {CH}_{3}-{I}+{HI}$