Question

Which one of the following structures represents
the peptide chain?
H O
I I II
(a) -N-C-N-C-NH-C-NH-
II I
O H
H H
I I I I I I I I
(b) -N-C-C-C-C-N-C-C-C-
II I I I I I I
O
H H H O
I I I I I I II
(c) -N-C-C-N-C-C-N-C-C-
I II I II I
O O
H O H
I I I II I I I I I
(d) -N-C-C-C-N-C-C-N-C-C-C-
I I I I I II I I
H O

Answer 1

Answer:

option C.

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Answer 2

Option D

Explanation:

A peptide chain must have alternate C=O and NH groups from the peptide linkages. This is seen only in option D.

Please find attached a picture showing the correct structure of the peptide molecule.

Option D is the answer.