c
$\begin{align}
& \begin{matrix}
6 \\
C{{H}_{3}}\,- \\
\end{matrix}\,\begin{matrix}
5 \\
CH\,=\, \\
\end{matrix}\,\begin{matrix}
4 \\
CH\,- \\
\end{matrix}\,\begin{matrix}
3 \\
C{{H}_{2}}\,-\, \\
\end{matrix}\begin{matrix}
2 \\
C\,\equiv \\
\end{matrix}\,\begin{matrix}
1 \\
CH \\
\end{matrix} \\
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\begin{matrix}
\downarrow \\
s{{p}^{2}} \\
\end{matrix}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\begin{matrix}
\downarrow \\
s{{p}^{3}} \\
\end{matrix}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\begin{matrix}
\downarrow \\
sp \\
\end{matrix}\, \\
\end{align}$