Which among the following is a polyester?

Options

A. Teflon
B. PVC
C. Nylon 6, 6
D. Terylene

Answer

To determine which among the given options is a polyester, we need to analyze each option based on their chemical structure and classification.

### Step-by-step Solution:

1. **Understanding Polyester**:
- A polyester is a type of polymer that contains the ester functional group (-COO-) in its main chain. Polyesters are typically formed through a condensation reaction between a diol and a dicarboxylic acid.

2. **Analyzing the Options**:
- **A. Teflon**:
- Teflon is known as polytetrafluoroethylene (PTFE). It is a fluoropolymer and does not contain ester linkages. Therefore, it is not a polyester.
- **B. PVC**:
- Polyvinyl chloride (PVC) is a polymer made from the polymerization of vinyl chloride. It is a thermoplastic but does not have ester linkages, so it is not a polyester.
- **C. Nylon 66**:
- Nylon 66 is a polyamide, which contains amide linkages (-CONH-). It is formed from hexamethylenediamine and adipic acid. Since it does not contain ester linkages, it is not a polyester.
- **D. Tereline**:
- Tereline is a type of polyester. It is formed from the reaction of a diol and a dicarboxylic acid, resulting in ester linkages in its structure.

3. **Conclusion**:
- Among the given options, **D. Tereline** is the correct answer as it is a polyester.

### Final Answer:
**D. Tereline** is a polyester.