(figure) $\xrightarrow[{(2)\,Zn}]{{(1)\,{O_3}}}\mathop {\begin{array}{*{20}{c}}
{\,\,\,\,O\,\,\,\,\,\,\,O\,\,} \\
{\,||\,\,\,\,\,\,\,\,\,||} \\
{H - C - C - H}
\end{array}}\limits_{Glyoxal} + $ $\mathop {\begin{array}{*{20}{c}}
{\,\,\,O\,\,\,\,\,O\,\,} \\
{\,||\,\,\,\,\,\,\,\,||} \\
{C{H_3} - C - C - C{H_3}}
\end{array}}\limits_{2,3 - Bu\tan edione} + \mathop {\begin{array}{*{20}{c}}
{\,\,\,\,\,\,O\,\,\,\,\,O} \\
{\,\,\,\,\,\,||\,\,\,\,\,\,||} \\
{C{H_3} - C - C - H}
\end{array}}\limits_{Pyrualdehyde} $
$C{H_3}C \equiv \,CC{H_3}\,\xrightarrow[{{\text{heat}}}]{{NaN{H_2}/{\text{inert solvent}}}}P$
ઉપર આપેલ સંયોજનો પૈકી, સંયોજનોની સંખ્યા કે જે હ્યુકેલના નિયમનું પાલન કરે છે તે$..........$