- A$\begin{array}{*{20}{c}}
{C{H_3} - CH - C{H_3}} \\
{|\,\,\,\,} \\
{\,OH}
\end{array}$ - ✓$\begin{array}{*{20}{c}}
{C{H_3} - C - C{H_3}} \\
{\,\,\,||\,\,\,\,} \\
{\,\,\,O\,\,\,\,}
\end{array}$ - C$\begin{array}{*{20}{c}}
{C{H_3} - C{H_2} - C - H} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,}
\end{array}$ - D$\begin{array}{*{20}{c}}
{C{H_3} - CH - C{H_2}} \\
{\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,OH\,\,\,\,\,\,\,\,OH}
\end{array}$
