Which of the following polymers is bodegradable?

Options

A.
B.
C.
D.

Explanation

To determine which of the given polymers is biodegradable, we will analyze each option based on their chemical structure and properties.

### Step-by-Step Solution:

1. **Identify the Polymers**:
- **Polymer 1**: Neoprene (Chloroprene)
- **Polymer 2**: BUNA-N (1,3-butadiene and acrylonitrile)
- **Polymer 3**: PHBV (Poly-beta-hydroxybutyrate-co-beta-hydroxyvalerate)
- **Polymer 4**: Nylon 6-6 (Hexamethylene diamine and adipic acid)

2. **Analyze Each Polymer**:
- **Neoprene**: This is a synthetic rubber that is not biodegradable. It is resistant to degradation and can persist in the environment for many years.
- **BUNA-N**: This is a type of synthetic rubber made from 1,3-butadiene and acrylonitrile. Like neoprene, it is also not biodegradable and can take a long time to decompose.
- **PHBV**: This polymer is made from 3-hydroxybutanoic acid and 3-hydroxypentanoic acid. It is known for its biodegradable properties, as it can be broken down by microorganisms in the environment.
- **Nylon 6-6**: This is a synthetic polymer made from hexamethylene diamine and adipic acid. It is not biodegradable and can last in the environment for a very long time.

3. **Conclusion**:
After analyzing all four polymers, we find that **PHBV** is the only biodegradable polymer among the options provided.

### Final Answer:
The biodegradable polymer is **PHBV (Poly-beta-hydroxybutyrate-co-beta-hydroxyvalerate)**.

---