$\begin{array}{*{20}{c}}
{C{H_3} - CH - C{H_2} - C{H_3}\xrightarrow[{hv}]{{C{l_2}}}(x)} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array} =$ અવકાશીય સમઘટકતા સહિત મોનોક્લોરો નીપજની સંખ્યા કેટલી છે ?