Which of the following is an example of polyester ?

Options

A. Butadiene-styrene copolymer
B. Melamine polymer
C. Neoprene
D. Poly- `beta` -hydroxybutyrate-co- `beta` -hydroxyvalerate

Answer

To determine which of the given options is an example of polyester, we first need to understand what a polyester is.

### Step-by-Step Solution:

1. **Definition of Polyester**:
- Polyester is a type of polymer formed from the reaction between a diol (a molecule with two alcohol groups) and a dicarboxylic acid (a molecule with two carboxylic acid groups).

2. **Identify Common Polyesters**:
- One of the most common examples of polyester is polyethylene terephthalate (PET), which is made from ethylene glycol and terephthalic acid.

3. **Components of Polyester**:
- **Diol**: Ethylene glycol (HO-CH2-CH2-OH)
- **Dicarboxylic Acid**: Terephthalic acid (C6H4(COOH)2)

4. **Polymerization Reaction**:
- The reaction between ethylene glycol and terephthalic acid leads to the formation of polyester through a condensation reaction, releasing water as a byproduct.

5. **Conclusion**:
- If the options provided include ethylene glycol and terephthalic acid or any polymer derived from these components, then that option would be an example of polyester.