
- A

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