Buna rubber is a polymer of

Options

A. 1,3-butadiene
B. Vinyl acetate
C. Styrene
D. None of these

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the polymer of Buna rubber, which is also known as butadiene rubber (BR). We need to identify the monomer from which this polymer is formed.

2. **Identifying the Monomer**: The monomer of Buna rubber is known to be 1,3-butadiene. This is a common knowledge in polymer chemistry.

3. **Chemical Structure of 1,3-Butadiene**: The chemical structure of 1,3-butadiene can be represented as:
\[ \text{CH}_2=\text{CH}-\text{CH}=\text{CH}_2 \]
This shows that it has two double bonds.

4. **Polymerization Process**: During the polymerization process, multiple 1,3-butadiene molecules (n number of them) undergo a reaction where their double bonds break and form single bonds with adjacent molecules. This results in a long chain of repeating units.

5. **Formation of Buna Rubber**: As the polymerization continues, the structure of the polymer can be represented as:
\[ \text{-(CH}_2-\text{CH}=\text{CH}-\text{CH}_2\text{)}_n \]
This indicates that the repeating unit is derived from 1,3-butadiene.

6. **Conclusion**: Therefore, the polymer Buna rubber is formed from the monomer 1,3-butadiene. The correct answer to the question is option 1: 1,3-butadiene.

**Final Answer**: Buna rubber is a polymer of 1,3-butadiene.

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