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Which one of the following is a chain growth polymer?

1. Starch
2. Nucleic acid
3. Polystyrene
4. Protein

Correct answer: Polystyrene

Solution

Polystyrene is a chain growth polymer formed by the addition polymerization of styrene monomers, unlike starch, nucleic acids, or proteins, which are step-growth polymers or biopolymers.

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