Question
The process requiring the absorption of energy is
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$\begin{array}{*{20}{c}}
{C{H_3}\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,\,} \\
{C{H_3} - CH - COOH}
\end{array}$ $\xrightarrow[{{H_3}{O^ + }}]{{LiAl{H_4}}}$ $I\,\xrightarrow{{PB{r_3}}}II\,\xrightarrow[{ether}]{{Mg}}$ $III\,\xrightarrow{{C{O_2}}}IV\,\xrightarrow{{{H_2}{O^ + }/{H^ + }}}V$
Nucleophile added in this reaction
