Which of the following ia a condensation polymer?

Options

A. Buna-N
B. Polystyrene
C. Nylon-6
D. Natural rubber

Answer

To determine which of the given options is a condensation polymer, we need to analyze each option based on its polymerization process.

### Step-by-Step Solution:

1. **Understand the Definition of Condensation Polymerization**:
- Condensation polymerization occurs when two or more monomers react to form a polymer, with the simultaneous elimination of a small molecule, often water or methanol.

2. **Analyze BUNA-N**:
- BUNA-N is formed from the copolymerization of 1,3-butadiene and acrylonitrile.
- This process is an addition polymerization, where no small molecules are eliminated.
- **Conclusion**: BUNA-N is **not** a condensation polymer.

3. **Analyze Polystyrene**:
- Polystyrene is produced from the polymerization of styrene.
- This is also an addition polymerization, where the double bond in styrene opens up to form long chains without the loss of any small molecules.
- **Conclusion**: Polystyrene is **not** a condensation polymer.

4. **Analyze Nylon 6**:
- Nylon 6 is made from caprolactam, which undergoes a ring-opening polymerization.
- During this process, water is eliminated when the amide bonds are formed.
- This fits the definition of condensation polymerization since a small molecule (water) is released.
- **Conclusion**: Nylon 6 **is** a condensation polymer.

5. **Analyze Natural Rubber**:
- Natural rubber is derived from the polymerization of isoprene.
- This process is an addition polymerization, where isoprene units link together without the release of any small molecules.
- **Conclusion**: Natural rubber is **not** a condensation polymer.

6. **Final Answer**:
- Based on the analysis, the only condensation polymer among the options is **Nylon 6**.