Answer: The monomer of nylon-6 is caprolactam.
Step-by-step explanation:
From the question, we are asked to draw the cyclic monomer from the structure of Nylon-6.
Two repeating monomer units can be seen in the polymeric structure given in the problem.
From this we can see and conclude that The monomer of nylon-6 is caprolactam.
attached is a diagrammatic representation of the Structure (Nylon-6 monomer).
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