(A) Buna-$S$ is a copolymer formed by the polymerization of $1,3$-butadiene and styrene in the presence of a catalyst. It is also known as $SBR$ (styr

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(A) Buna-$S$ is a copolymer formed by the polymerization of $1,3$-butadiene and styrene in the presence of a catalyst. It is also known as $SBR$ (styrene-butadiene rubber). The reaction is: $nCH_2=CH-CH=CH_2 + nC_6H_5CH=CH_2 \xrightarrow{Na} (-CH_2-CH=CH-CH_2-CH(C_6H_5)-CH_2-)_n$