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Which of the following organic compounds polymerizes to form the polyester Dacron?

1. Propylene and para HO-(C6H4)-OH
2. Benzoic acid and ethanol
3. Terephthalic acid and ethylene glycol
4. Benzoic acid and para HO-(C6H4)-OH

Correct answer: Terephthalic acid and ethylene glycol

Solution

Dacron is a polyester formed by the condensation polymerization of terephthalic acid and ethylene glycol, producing ester linkages.

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