$\begin{array}{*{20}{c}}
{H\,\,\,\,\,\,\,H\,\,\,\,\,\,\,\,\,\,\,\,} \\
{\,\,|\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_3}{ - ^2}C{ - ^3}CH{ - ^4}C{H_2} - H} \\
{\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{\,\,{\,_1}C{H_2} - H\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$ $C_1-H, C_2-H, C_3-H$ and $C_4-H$ the homolytic bond dissociation energy is in the order
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