Discussion
Poly(vinyl chloride) requires a heat stabiliser during processing because it tends to
Answer: B
Correct answer: eliminate hydrogen chloride
Heating PVC strips hydrogen chloride from the chain, leaving a conjugated sequence that absorbs visible light and discolours the material, and the acid released catalyses further elimination - so the degradation accelerates once it begins. Stabilisers based on metal soaps or organotins scavenge the acid and interrupt that autocatalysis, and without them PVC could not be processed at all.
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