Q7 / 180 · KCET 2013 · Chemistry

In Buna-S, the symbol Bu stands for

  • A
    1-butene
  • B
    $n$-butene
  • C
    2-butene
  • Correct answer
    D
    butadiene

Solution

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

Hence, the correct answer is option: 'D'.

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