$\begin{align} & C{{H}_{3}}\,-\,\,C{{H}_{2}}\,-\,C\equiv \overset{-}{\mathop{C}}\,\overset{+}{\mathop{N}}\,a\,\,\xrightarrow{C{{H}_{3}}\,-\,\,C{{H}_{2}}\,-\,\,C{{H}_{2}}\,-\,\,C{{H}_{2}}\,-\,\,Br} \\
& C{{H}_{3}}\,-\,\,C{{H}_{2}}\,-\,\underset{3\,\,-\,\,octyne}{\mathop{C{{H}_{2}}\,-\,\,C{{H}_{2}}\,-\,\,C}}\,\equiv C\,-\,\,C{{H}_{2}}\,\,-\,\,C{{H}_{3}} \\
\end{align}$

નીપજ $'P'$ માં હાજર ઓકસીજન પરમાણુઆની સંખ્યા ............... છે.

$CH_3 CH_2 CH=CH_2 \xrightarrow{{HBr/{H_2}{o_2}}}\,Y\,\xrightarrow{{{C_2}{H_5}ONa}}Z$