Question

Which statement is incorrect about peptide bond?

• A. $CN$ bond length in patients is longer than the usual bond length of N-bond
• B. of $-\underset{O}{\underset{||}{C}}-NH-group$Spectroscopic analysis show planar structure
• C. $CN$ bond length in proteins is smaller than usual bond length of $CN$ bond
• D. None of above

Answer 1

The correct option is A $CN$ bond length in patients is longer than the usual bond length of N-bond

Due to the resonance effect in amino acid the $CN$ bond length becomes shorter than single bonded $C-N$ bond length.