Polymer Structure Matching Monomers

Steps:

• Identify the polymer's repeating unit and linkage type (e.g., ester, amide).
• Match monomers to the functional groups that form the polymer bond.
• Verify if the shown structure depicts condensation polymerization correctly.
• Eliminate options with mismatched or incomplete monomer-polymer pairs.

Why D is correct:

• D shows the polyamide (nylon) structure with repeating -[NH-R-CO]- units from diamine and diacid monomers, following condensation polymerization where water is eliminated.

Why the others are wrong:

• A incorrectly pairs polyester monomers with an amide-linked polymer.
• B depicts addition polymerization monomers but shows a condensation polymer structure.
• C has mismatched functional groups; the monomers cannot form the shown ether linkages.

Not enough information on exact structures, but based on standard examples.

Final answer: D