The polymer chains are held together by hydrogen bonding in a polymer X. Polymer X is formed from monomers Y and Z. What are Y and Z?
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Polymers like Nylon (polyamides) are characterized by strong interchain hydrogen bonding between the $\text{N-H}$ proton of one chain and the $\text{C=O}$ oxygen of an adjacent chain. This strong attraction is the source of their high tensile strength and crystalline nature.