Question

What are the monomers of Buna-S?

• A. Ethene and Styrene
• B. 1,3-Butadiene and Styrene
• C. Isoprene and Styrene
• D. Butadiene and Vinyl Chloride

Hint:

Common synthetic rubbers: Buna-S (Butadiene + Styrene), Buna-N (Butadiene + Acrylonitrile), and Neoprene (Chloroprene).

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
The question asks for the starting building blocks (monomers) used to synthesize the copolymer known as Buna-S, which is a type of synthetic rubber.
Step 2: Detailed Explanation:
Buna-S is also known as SBR (Styrene-Butadiene Rubber).
The name is derived from:
- Bu: 1,3-Butadiene (\(CH_2=CH-CH=CH_2\))
- na: Sodium (Na), which was originally used as the catalyst for polymerization.
- S: Styrene (\(C_6H_5CH=CH_2\))
It is produced through the addition copolymerization of these two monomers, typically in a ratio of 3 parts butadiene to 1 part styrene.
Step 3: Final Answer:
The monomers of Buna-S are 1,3-Butadiene and Styrene.