Question

The monomers of Buna-$S$ rubber are

• A. vinyl chloride and sulphur
• B. butadiene and phenol
• C. styrene and butadiene
• D. isoprene and butadiene

Answer 1

Answer: (C)

styrene and butadiene

Answer 2

Buna-S rubber is also called SBR ie, styrene
-butadiene rubber. It is a copolymer of $75 \%$ butadiene $\left( CH _{2}= CH - CH = CH _{2}\right)$ and $25 \%$
styrene $\left( C _{6} H _{5}- CH = CH _{2}\right)$