(B) Buna-$S$ is a synthetic rubber formed by the copolymerization of $1,3$-butadiene and styrene in the presence of a peroxide catalyst. The name 'Bun

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(B) Buna-$S$ is a synthetic rubber formed by the copolymerization of $1,3$-butadiene and styrene in the presence of a peroxide catalyst. The name 'Buna' is derived from 'Bu' for butadiene and 'na' for sodium (which was used as a catalyst in early processes),while '$S$' stands for styrene.