C-N Bond Differences

Correct Answer: E. the C-N bond is shorter because it is a triple bond.

The bond length depends on the type of bond. Single bonds are longer than double bonds, which are longer than triple bonds. Drawing the Lewis dot diagrams for these compounds gives some insight into the type of bonds formed between C and N and C and H. The C-N bond is shorter as it is a triple bond. The C-H bond would be longer since it is a single bond. The magnitude of the difference cannot be calculated based on the limited information in the question, but at least the relative sizes of the bonds can still be determined.

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