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Buna-S can be represented as -

1. CH = CH – CH = CH – CH – CH 2 | C 6 H 5 n
2. CH 2 – CH = CH – CH 2 – CH – CH 2 | C 6 H 5 n
3. CH 2 – CH = C – CH = CH – CH 2 | C 6 H 5 n
4. CH 2 – CH = CH – CH = C – CH 2 | C 6 H 5 n

Correct answer: CH 2 – CH = CH – CH 2 – CH – CH 2 | C 6 H 5 n

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