JEE Main Chemistry question

Which of the following structures represents the peptide chain?

(A)-NH-C(=O)-NH-C(=O)-NH-C(=O)-NH- (two nitrogen atoms linked directly in sequence, without an intervening -carbon between some of the carbonyls)
(B)A chain with the connectivity (an extra backbone carbon inserted between successive residues)
(C)H_2N-CH_2-CO-NH-CH_2-CO-NH-CH_2-COOH (a repeating backbone unit)Correct
(D)A chain with the connectivity but with the carbonyl oxygen misplaced on the wrong backbone carbon

Answer: (C)

Solution

A genuine peptide chain is built from the repeating backbone unit , in which each amide nitrogen is bonded to an -carbon (bearing the side chain and an ), which is in turn bonded to a carbonyl carbon linked to the next residue's nitrogen — exactly the pattern

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Question ID VK-151210