Buna-S is a polymer of :

Options

A. Butadiene only
B. Butadiene and nitryl
C. Styrene only
D. Butadiene and styrene

Answer

To determine the polymer Buna-S, we need to identify its monomers. Here’s a step-by-step solution:

### Step 1: Understand the Structure of Buna-S
Buna-S is a synthetic rubber, and its structure consists of repeating units derived from specific monomers.

### Step 2: Identify the Monomers
1. **First Monomer**: The first monomer is **1,3-butadiene**. Its chemical structure can be represented as:
\[ \text{CH}_2= \text{CH}-\text{CH}=\text{CH}_2 \]
This molecule has two double bonds and is crucial for the formation of Buna-S.

2. **Second Monomer**: The second monomer is **styrene**. Its chemical structure is:
\[ \text{C}_6\text{H}_5-\text{CH}=\text{CH}_2 \]
Styrene has a vinyl group attached to a benzene ring.

### Step 3: Confirm the Copolymer Formation
Buna-S is formed by the copolymerization of these two monomers:
- **1,3-butadiene**
- **Styrene**

### Step 4: Conclusion
Thus, the polymer Buna-S is a copolymer made from **1,3-butadiene and styrene**.

### Final Answer
Buna-S is a polymer of **1,3-butadiene and styrene**.

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