A lactam can be a primary amide.

Question

Quizplus · Accepted Answer

A lactam is a cyclic amide, not a primary amide. Primary amides have the formula RCONH2, where the amide nitrogen is bonded to one carbon atom (the carbonyl carbon) and two hydrogen atoms, whereas lactams are cyclic structures formed from the intramolecular reaction of an amino group and a carboxylic acid group within the same molecule, resulting in a ring structure that does not have the amide nitrogen bonded to two hydrogen atoms.

A Lactam Can Be a Primary Amide