question_answer

                Which statement is incorrect about peptide bond \[-\overset{\begin{smallmatrix}  O \\  |\,\,| \end{smallmatrix}}{\mathop{C}}\,-\overset{\centerdot \,\,\centerdot }{\mathop{NH}}\,-\]?                                                    

A)                 C?N bond length in proteins is longer than usual bond length of N-bond

B)                 Spectroscopic analysis show planar structure of \[-C-\underset{\begin{smallmatrix}  |\,\,\,| \\  O \end{smallmatrix}}{\mathop{NH}}\,-\] group

C)                 C?N bond length in proteins is smaller than usual bond length of C?N bond

D)                 None of the above

Correct Answer: C

Solution :

                Peptide bond is formed by the reaction of ?COOH group of one amino add with the \[-N{{H}_{2}}\] group of another amino acid and represented as                                 As partial double bond character found between C?N bond, the bond length of C?N in protein should be smaller than usual C?N bond.