Assertion : PHBV is a biodegradable polymer.
Reason : PHBV is an aliphatic polyester .

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion .
B. If both assertion and reason are true but reason is not the correct explanation of assertion .
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Answer

To solve the assertion-reason question regarding PHBV, we will analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "PHBV is a biodegradable polymer."
- Biodegradable polymers are those that can be broken down by microorganisms into smaller components such as water, carbon dioxide, and biomass.
- PHBV, or poly(3-hydroxybutyrate-co-3-hydroxyvalerate), is indeed known for its biodegradability due to its aliphatic structure, which allows microbial action to break it down.

2. **Understanding the Reason**:
- The reason states that "PHBV is an aliphatic polyester."
- PHBV is formed from the polymerization of 3-hydroxybutanoic acid and 3-hydroxyvaleric acid, which are both aliphatic compounds.
- Being a polyester means that it contains ester linkages, which are formed through the reaction of alcohol and carboxylic acid, leading to the formation of long chains.

3. **Evaluating the Relationship**:
- While both statements are true, the reason does not provide a direct explanation for the assertion.
- The fact that PHBV is an aliphatic polyester contributes to its biodegradability, but the assertion specifically states that it is biodegradable, which is a broader characteristic that is not solely explained by its being an aliphatic polyester.

4. **Conclusion**:
- Both the assertion and reason are true statements, but the reason does not adequately explain why PHBV is biodegradable. Therefore, the correct answer to the assertion-reason question is that both statements are true, but the reason is not a valid explanation for the assertion.

### Final Answer:
Both the assertion and reason are true, but the reason does not explain the assertion.