Which of the following is a peptide linkage :

- C O N H -

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- C O O N H_{2} -

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- C H_{2} N H -

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None of these

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Solution

The correct option is C $- C O N H -$

Option (A) is correct.
Peptides are the polyamides formed by the condensation of amino group of one amino acid with the carboxylic group of the other. They are in fact secondary amides having $C O N H$ linkage commonly referred to as peptide linkage.

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