Which of the follownig is a condensation polymer?

Options

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

Answer

To determine which of the following is a condensation polymer, we need to understand the process of condensation polymerization and analyze the given options.

### Step-by-Step Solution:

1. **Understanding Condensation Polymerization**:
- Condensation polymerization is a process where monomeric units combine to form a polymer while simultaneously eliminating small molecules, such as water or alcohol. This is different from addition polymerization, where no small molecules are lost.

2. **Analyzing the Options**:
- We need to evaluate each option to see if it fits the criteria for condensation polymerization.

3. **Option 1: Teflon**:
- Teflon is made from tetrafluoroethane and is formed through addition polymerization. In this process, the monomers add to each other without the loss of any small molecules. Therefore, Teflon is **not** a condensation polymer.

4. **Option 2: Orlon (Polyacrylonitrile)**:
- Orlon is also produced through addition polymerization using acrylonitrile as the monomer. Similar to Teflon, there is no loss of small molecules in this process. Thus, Orlon is **not** a condensation polymer.

5. **Option 3: Dacron (Terylene)**:
- Dacron is formed from the reaction between ethylene glycol and terephthalic acid. The reaction involves the formation of ester linkages and the elimination of water molecules. This process clearly fits the definition of condensation polymerization. Therefore, Dacron is a **condensation polymer**.

6. **Option 4: Polyethylene**:
- Polyethylene is produced from the polymerization of ethylene through addition polymerization. There is no elimination of small molecules in this process, so polyethylene is **not** a condensation polymer.

7. **Final Conclusion**:
- Based on the analysis, the correct answer is **Dacron (Terylene)**, as it is the only option that undergoes condensation polymerization.