Discussion

Match the Polymer with the most suitable Monomer combinations from which it is synthesized.

	Polymer		Monomer combinations
P	Polyurethane	1	Maleic acid and propylene glycol
Q	Epoxy	2	Pyromellitic anhydride and p,p′-diamino diphenyl ether
R	Polyimide	3	Epichlorohydrin and bisphenol A
S	Polyester	4	Hexamethylene diisocyanate and tetramethylene glycol

Answer: A

The match is P-4; Q-3; R-2; S-1.

Polyurethane forms by the addition of a diisocyanate to a diol: hexamethylene diisocyanate and tetramethylene glycol (4).
Epoxy resin is made from epichlorohydrin and bisphenol A (3), the classic diglycidyl ether of bisphenol A.
Polyimide (as in Kapton) is made from pyromellitic dianhydride and 4,4′-diaminodiphenyl ether (2).
Unsaturated polyester is made from maleic acid (or anhydride) and propylene glycol (1).

The other options swap the epoxy and polyimide monomers or give polyurethane the anhydride-amine pair, which forms an imide, not a urethane link.

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