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Question
Indicate the σ and π bonds in the following molecules:
CH3NO2
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Solution
\[\begin{array}{cc}
\phantom{.......}\ce{H}\phantom{.....}\ce{O}\\
\phantom{.......}|\phantom{.....}//\\
\ce{H - C - N}\\
\phantom{......}|\phantom{.....}\backslash\\
\phantom{......}\ce{H}\phantom{.....}\ce{O}
\end{array}\]
In CH3NO2 (nitromethane), there are 6 sigma (σ) bonds (3 C-H, 1 C-N, 1 N-O) and 1 pi (π) bond (in the N=O double bond), arising from the resonance structure where one N-O bond is a double bond, contributing one sigma and one pi bond, while the other N-O bond is a single sigma bond.
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