Question

In Buna- $S$, the symbol ${}^{\prime }B{u}^{\prime }$ stands for

• A. $1$-Butene
• B. $n$-Butene
• C. $2$-Butene
• D. Butadiene

Answer 1

Answer: (D)

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





In Buna- $S,Bu$ stands for butadiene, $Na$ for sadium which is the polymerising agent and $S$ stands for styrene.