Which of the following polymers is biodegradable ?

Options

A. `(--CH_(2)-underset("Cl")underset("|")"C"=CH-CH_(2)--)_(n)`
B.
C.
D.

Explanation

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

### Step-by-Step Solution:

1. **Understanding Biodegradable Polymers**:
- Biodegradable polymers are those that can be broken down by microorganisms into natural substances like water, carbon dioxide, and biomass.

2. **Analyzing the Options**:
- **Option A: Neoprene**
- Neoprene is made from the monomer chloroprene (C4H5Cl). It is a synthetic rubber and is not biodegradable.

- **Option B: Buna**
- Buna is a type of synthetic rubber made from the polymerization of 1,3-butadiene and acrylonitrile. It is also not biodegradable.

- **Option C: PHBV (Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)**
- PHBV is a copolymer made from beta-hydroxybutyrate and beta-hydroxyvalerate. This polymer is known for its biodegradability as it can be broken down by microorganisms.

- **Option D: Nylon 6-6**
- Nylon 6-6 is a synthetic polymer formed from hexamethylenediamine and adipic acid. It is widely used in textiles and plastics but is not biodegradable.

3. **Conclusion**:
- After analyzing all options, the only biodegradable polymer among the given choices is **PHBV** (Option C).

### Final Answer:
The biodegradable polymer is **PHBV**.

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