Discussion
Assertion (A): A semicrystalline polymer has both a glass transition and a melting point.
Reason (R): The two temperatures belong to the amorphous and crystalline regions respectively.
Answer: A
Both are true and the reason gives the reason there are two: a wholly amorphous polymer shows only a glass transition, which is why polystyrene has no melting point in the ordinary sense. Crystallinity in a polymer is never complete.
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