A condensation polymer among the following is

Options

A. Dacron
B. Polythene
C. Buna-N
D. Natural rubber

Answer

To determine which of the given options is a condensation polymer, we need to understand what a condensation polymer is and analyze each option accordingly.

### Step-by-Step Solution:

1. **Define Condensation Polymer**:
A condensation polymer is formed when monomers join together with the elimination of a small molecule, typically water or methanol. This process is known as condensation.

2. **Analyze the Options**:
- **Dacron**: Dacron is a brand name for a type of polyester, which is indeed a condensation polymer. It is formed from the reaction of diols and dicarboxylic acids, resulting in the release of water.
- **Polyethylene**: Polyethylene is an addition polymer made from the polymerization of ethylene monomers. It does not involve the elimination of any small molecules.
- **Bona**: This term is not commonly associated with a specific polymer type, but if referring to a type of rubber or similar material, it is likely an addition polymer as well.
- **Natural Rubber**: Natural rubber is also an addition polymer, primarily composed of isoprene monomers. It does not involve condensation.

3. **Conclusion**:
Among the options provided, **Dacron** is the only condensation polymer.

### Final Answer:
The condensation polymer among the following is **Dacron**.