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Which statement is incorrect about peptide bond?

1. C—N bond length in proteins is longer than usual bond length of the C—N bond
2. Spectroscopic analysis shows planar structure of the —C—NH— group
3. C—N bond length in proteins is smaller than usual bond length of the C—N bond
4. None of the above

Correct answer: C—N bond length in proteins is longer than usual bond length of the C—N bond

Solution

The C—N bond length in a peptide bond is shorter than a usual C—N bond due to partial double-bond character from resonance, making option A incorrect.

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