Question
How many degrees of unsaturation are there the following compound ?



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$\begin{array}{*{20}{c}}
O \\
{||} \\
{C{H_3} - C - C{H_3}}
\end{array}\xrightarrow{{{C_6}{H_5}COOOH}}\begin{array}{*{20}{c}}
{O\,\,\,\,\,\,\,\,\,} \\
{||\,\,\,\,\,\,\,\,\,} \\
{C{H_3} - C - O - C{H_3}}
\end{array}$
The above reaction is known as :
$CH_3-COOH$ $\mathop {\xrightarrow{{(i)\,B{r_2}/P}}}\limits_{(ii)\,NaCN\,(iii)\,{H_2}O/{H^ \oplus }/\Delta } \,[X]$
$[X]$ will be :

