Of the following which one is classified as polyester polymer?

Options

A. Bakelite
B. Melamine
C. Nylon-66
D. Terylene

Explanation

To determine which of the given options is classified as a polyester polymer, we need to understand what a polyester is.

### Step-by-Step Solution:

1. **Define Polyester**:
- A polyester is a type of polymer that contains ester functional groups in its repeating units. The general structure of a polyester includes the presence of -COO- (ester) groups in the main chain of the polymer.

2. **Examine the Options**:
- The options provided are:
- Bakelite
- Melamine
- Nylon 66
- Terline

3. **Analyze Each Option**:
- **Bakelite**: This is a type of thermosetting plastic made from phenol and formaldehyde. It does not contain ester functional groups and is not classified as a polyester.
- **Melamine**: This is a type of resin made from melamine and formaldehyde. It is also not a polyester as it does not have ester functional groups.
- **Nylon 66**: This is a polyamide, which means it is made from amide linkages (-CONH-). Therefore, it is not a polyester.
- **Terline**: This is a type of polyester, specifically a synthetic fiber that contains ester functional groups in its structure.

4. **Conclusion**:
- Among the options provided, **Terline** is classified as a polyester polymer because it contains ester functional groups in its repeating units.

### Final Answer:
**Terline is classified as a polyester polymer.**

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