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Which of the following addition polymers are copolymers? (i) Neoprene (ii) Buna-N (iii) Nylon-66 (iv) SBR

1. only iv
2. ii & iv
3. iii & iv
4. ii, iii & iv

Correct answer: ii & iv

Solution

Among the given, only Buna-N (butadiene + acrylonitrile) and SBR (styrene + butadiene) are addition copolymers. Neoprene is an addition homopolymer, and Nylon-66 is a condensation polymer (not addition), so it is excluded by the qualifier 'addition polymer which is/are copolymer'.

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