The monomers of Buna -S rubber are

Options

A. Styrene and butadiene
B. Isoprene and butadiene
C. Isoprene and sulphur
D. Butadiene and acrylonitrile

Answer

To determine the monomers of Buna-S rubber, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Name of the Polymer**:
- The polymer in question is Buna-S rubber. The name gives us a clue about its composition.

2. **Understand the Components of Buna-S**:
- Buna-S is a copolymer, which means it is made from two different types of monomers. The name "Buna" is derived from "butadiene" and "S" stands for "styrene".

3. **Identify the Monomers**:
- The two monomers that make up Buna-S rubber are:
- **1,3-butadiene**: This is a diene with the chemical structure CH2=CH-CH=CH2.
- **Styrene**: This is an aromatic compound with the chemical structure C6H5-CH=CH2.

4. **Write the Chemical Structures**:
- For **1,3-butadiene**:
- Structure: CH2=CH-CH=CH2
- For **Styrene**:
- Structure: C6H5-CH=CH2

5. **Conclusion**:
- Therefore, the monomers of Buna-S rubber are 1,3-butadiene and styrene.

### Final Answer:
The monomers of Buna-S rubber are **1,3-butadiene and styrene**.

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