Buna-S, is obtained by copolymerization of ...................with ...................

Answer

To solve the question about Buna-S, we need to identify the monomers involved in its copolymerization. Here’s the step-by-step solution:

### Step 1: Identify the Polymer
Buna-S is a type of synthetic rubber. It is important to know that it is a copolymer.

### Step 2: Determine the Monomers
The two monomers that are used to produce Buna-S are:
1. **Butadiene**
2. **Styrene**

### Step 3: Write the Chemical Structures
- **Butadiene**: The chemical structure of butadiene is represented as:
\[ \text{CH}_2= \text{CH}-\text{CH}=\text{CH}_2 \]
- **Styrene**: The chemical structure of styrene is represented as:
\[ \text{CH}_2= \text{CH}-\text{C}_6\text{H}_5 \]
(where C6H5 represents a phenyl group).

### Step 4: Understand Copolymerization
During copolymerization, butadiene and styrene undergo a chemical reaction to form a long-chain polymer, which is Buna-S.

### Step 5: Conclusion
Thus, we can conclude that Buna-S is obtained by the copolymerization of **butadiene** with **styrene**.

### Final Answer:
Buna-S is obtained by copolymerization of **butadiene** with **styrene**.

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