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 understand what a polyester is and identify the options provided.

### Step-by-Step Solution:

1. **Define Polyester**:
- Polyesters are a category of polymers formed through the reaction of diols (alcohols with two hydroxyl groups) and dicarboxylic acids. They are characterized by the presence of ester functional groups in their main chain.

2. **Identify the Options**:
- The question mentions several compounds, including Teflon and Terylene. We need to analyze each one to see if it fits the definition of a polyester.

3. **Analyze Teflon**:
- Teflon, also known as polytetrafluoroethylene (PTFE), is a polymer made from tetrafluoroethylene. It does not contain ester groups and is not formed from the reaction of diols and dicarboxylic acids. Therefore, Teflon is **not a polyester**.

4. **Analyze Terylene**:
- Terylene, also known as polyethylene terephthalate (PET), is made from the reaction of ethylene glycol (a diol) and terephthalic acid (a dicarboxylic acid). It contains ester linkages in its structure, which classifies it as a polyester. Therefore, Terylene is **a polyester**.

5. **Conclusion**:
- Among the options provided, Terylene is the correct answer as it is a polyester.

### Final Answer:
- **Terylene is a polyester.**