$\begin{matrix}
   C{{H}_{3}}-C{{H}_{2}}-C=C=O  \\
   \,\,\,\,\,\,\,\,\,\,\,\,|  \\
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{3}}  \\
\end{matrix}$

Reactions given are as following:

$\begin{array}{*{20}{c}}
  {C{H_3} - C{H_2} - C = C = O\xrightarrow{{N{H_3}}}} \\ 
  {{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} |{\mkern 1mu} \,\,{\mkern 1mu} \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\mkern 1mu} } \\ 
  {{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_{3\,}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}$   $\left[ \begin{matrix}
   C{{H}_{3}}-C{{H}_{2}}-C=\overset{+}{\mathop{C}}\,-{{O}^{-}}  \\
   \,\,\,\,\,\,\,\,\,\,\,\,|  \\
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{3}}  \\
\end{matrix} \right]$ 

                             $\updownarrow $

$\left[ \begin{matrix}
   C{{H}_{3}}-C{{H}_{2}}-C=C-OH  \\
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,|  \\
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{3}}\,\,N{{H}_{2}}\,\,  \\
\end{matrix} \right]$

                                $\downarrow $

$\begin{matrix}
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\begin{matrix}
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,  \\
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||  \\
\end{matrix}\,\,\,\,\,\,\,\,\,  \\
   C{{H}_{3}}-C{{H}_{2}}-CH-C-N{{H}_{2}}  \\
   |  \\
   \,\,\,\,\,\,\,\,C{{H}_{3}}  \\
\end{matrix}$

$\begin{matrix}
   C{{H}_{3}}-C{{H}_{2}}-C=C=O\xrightarrow{{{H}_{2}}O}  \\
   \,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\, \,\,\,\, \\
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{3}}\,\,\,\,\,\,\,\,\,  \\
\end{matrix}$   $\begin{matrix}
   C{{H}_{3}}-C{{H}_{2}}-CH-COOH  \\
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
\end{matrix}$

$\begin{matrix}
   C{{H}_{3}}-C{{H}_{2}}-C=C=O\xrightarrow{C{{H}_{3}}COOH}  \\
   \,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   \,\,\,\,\,\,\,\,\,\,C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
\end{matrix}$  $\begin{matrix}
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\begin{matrix}
   O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O  \\
   ||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||  \\
\end{matrix}  \\
   C{{H}_{3}}-C{{H}_{2}}-CH-C-O-C-C{{H}_{3}}  \\
   |\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
\end{matrix}\,$