1 $\begin{array}{*{20}{c}}
{C{H_2} = CHCC{H_2}C{H_2}OH} \\
{||\,\,\,\,\,} \\
O\,\,\,\,
\end{array}$
2 $\begin{array}{*{20}{c}}
{C{H_2} = CHCHC{H_2}CHO} \\
| \,\,\,\\
{OH}
\end{array}$
3 $\begin{array}{*{20}{c}}
{C{H_2} = CHCC{H_2}CHO} \\
{||} \\
O
\end{array}$
4 $\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\
{C{H_2} = CHCC{H_2}COH} \\
{\,||} \\
{\,O}
\end{array}$