Incorrect statement about PHBV is

Options

A. it is co-polymer of 3-hydroxybutanoic acid and 3-hydroxypentanoic acid
B. it has ester linkage
C. excess of hydroxy pentanoic acid makes the polymer more together
D. it undergo degradation by bacteria

Answer

To determine the incorrect statement about PHBV (Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)), let's analyze each option provided in the question.

### Step 1: Understand the Composition of PHBV
PHBV is a copolymer made from two monomers: 3-hydroxybutanoic acid and 3-hydroxyvaleric acid. This means that it is formed by the polymerization of these two different monomer units.

**Hint:** Remember that a copolymer consists of two different types of monomers.

### Step 2: Analyze the Statements
1. **Statement 1:** "It is a copolymer of 3 hydroxybutanoic acid and 3 hydroxypentanoic acid."
- This statement is **incorrect** because PHBV is actually a copolymer of 3-hydroxybutanoic acid and 3-hydroxyvaleric acid, not hydroxypentanoic acid.

2. **Statement 2:** "It has ester linkage."
- This statement is **correct**. PHBV contains ester linkages due to the nature of its polymerization.

3. **Statement 3:** "Excess of hydroxypentanoic acid makes the polymer more together."
- This statement is **incorrect**. The presence of excess hydroxypentanoic acid does not necessarily make the polymer "more together" or more cohesive; rather, it alters the properties of the polymer.

4. **Statement 4:** "It undergoes degradation by bacteria."
- This statement is **correct**. PHBV is known to be biodegradable and can be degraded by bacteria.

### Step 3: Identify the Incorrect Statement
From the analysis:
- The first statement is incorrect because it misidentifies one of the monomers.
- The third statement is also misleading but does not directly state a factual error about the composition.

However, since the question specifically asks for the incorrect statement about PHBV, the most clear-cut incorrect statement is the first one.

### Conclusion
The incorrect statement about PHBV is:
**"It is a copolymer of 3 hydroxybutanoic acid and 3 hydroxypentanoic acid."**

### Final Answer
The correct answer is the first option.

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