Structure of some important polymers are given. Which one represents Buna-S ?
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The Correct Option is B
Solution and Explanation
Option (1) has a \(\mathrm{-CN}\) side group, i.e. butadiene + acrylonitrile = Buna-N (nitrile rubber).
Option (3) has a methyl group on the double-bond carbon: polyisoprene (natural rubber); option (4) has Cl there: neoprene.
Option (2) contains a \(\mathrm{C_6H_5}\) (phenyl) side group on the chain, so it is Buna-S.
Answer: (2) the polymer with the \(\mathrm{C_6H_5}\) side group
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