Question

Which statement is incorrect about peptide bond?

• A. C-N bond length in proteins is longer than usual C-N bond length.
• B. Spectroscopic analysis shows planar structure of C-NH bond.
• C. C-N bond length in proteins is smaller than usual C-N bond length.
• D. None of these

Hint:

Peptide bonds in proteins exhibit partial double bond character, which makes the C-N bond shorter than in typical amines.

Answer 1

The Correct Option is A

Step 1: Understand peptide bonds.
Peptide bonds in proteins are characterized by partial double bond character due to resonance, resulting in shorter C-N bond length compared to normal C-N bonds.
Step 2: Conclusion.
The C-N bond length in proteins is smaller than usual C-N bond length. Final Answer: \[ \boxed{\text{C-N bond length in proteins is longer than usual C-N bond length.}} \]