Which of the follownig is a condensation polymer?

Options

A. Teflon
B. orlon
C. Dacron
D. Polyethene

Answer

To determine which of the given options is a condensation polymer, we need to understand the characteristics of condensation polymers. Condensation polymers are formed through a step-growth polymerization process where monomers react to form a polymer while releasing small molecules as by-products, typically water or methanol.

### Step-by-step Solution:

1. **Identify the Options**:
- We need to analyze the given options (though they are not explicitly listed in your question, we will assume common examples such as Teflon, Orlon, Dacron, etc.).

2. **Understand the Structure of Each Polymer**:
- **Teflon**: Made from tetrafluoroethylene (C2F4). It undergoes addition polymerization where the double bonds open up to form long chains without releasing any by-products.
- **Orlon**: A type of acrylic polymer made from acrylonitrile (C3H3N). Similar to Teflon, it undergoes addition polymerization, resulting in no by-products being released.
- **Dacron (Terylene)**: Formed from the reaction of terephthalic acid and ethylene glycol. In this case, the hydroxyl (–OH) group from ethylene glycol and a hydrogen (–H) from terephthalic acid combine to release water (H2O) as a by-product during polymerization.

3. **Determine the Type of Polymerization**:
- **Teflon**: Addition polymer (no by-products).
- **Orlon**: Addition polymer (no by-products).
- **Dacron**: Condensation polymer (water is released as a by-product).

4. **Conclusion**:
- Among the options analyzed, **Dacron** is the condensation polymer because it involves the release of water during its formation.

### Final Answer:
**Dacron is a condensation polymer.**