In Buna-S,the symbol Bu stands for | vedclass

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(D) When a mixture of $1,3-$butadiene and styrene in the ratio of $3:1$ undergoes copolymerisation in the presence of sodium,it forms a styrene-butadi

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butadiene

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(D) When a mixture of $1,3-$butadiene and styrene in the ratio of $3:1$ undergoes copolymerisation in the presence of sodium,it forms a styrene-butadiene copolymer,commonly known as styrene-butadiene rubber $(SBR)$ or Buna-$S$.In the name Buna-$S$,'$Bu$' stands for butadiene,'$Na$' stands for sodium (which acts as the polymerising agent),and '$S$' stands for styrene.

In Buna-$S$,the symbol $Bu$ stands for

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