Buna-$N$ is a co-polymer of $1,3-$Butadiene and $\underline{X}$. What is $\underline{X}$?
- A$CH_2=CH-CN$
- B$CH_2=CH-Cl$
- C$CH_2=CH-C_6H_5$
- D$CH_2=CH-CH_3$
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