Discussion
The correct increasing order of average bond length for C=C, N=O, C-C, N-O is
Answer: E
The increasing order is \(\mathrm{N{=}O \lt C{=}C \lt N{-}O \lt C{-}C}\).
Double bonds are shorter than single bonds, and bonds between smaller atoms are shorter. The textbook's average bond lengths are N=O 122 pm, C=C 133 pm, N-O 136 pm and C-C 154 pm.
Both double bonds come before both single bonds, and within each pair the bond involving nitrogen and oxygen, the smaller atoms, is the shorter. The other options put a single bond before a double bond somewhere.
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