Monomer(s) of which of the given polymer is chiral?

Options

A. (a) Buna-S
B. (b) Neoprene
C. (c) Nylon-6,6
D. (d) PHBV

Answer

To determine which polymer has a chiral monomer, we need to analyze the monomers of the given polymers: Buna-S, Neoprene, Nylon 6,6, and PHBV.

### Step-by-Step Solution:

1. **Identify the Polymers and Their Monomers**:
- **Buna-S**: The monomer for Buna-S is 1,3-butadiene and styrene.
- **Neoprene**: The monomer for Neoprene is chloroprene (2-chloro-1,3-butadiene).
- **Nylon 6,6**: The monomer for Nylon 6,6 is hexamethylenediamine and adipic acid.
- **PHBV**: The monomer for PHBV (Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)) is 3-hydroxybutanoic acid and 3-hydroxyvaleric acid.

2. **Analyze Each Monomer for Chirality**:
- **Buna-S Monomers**: 1,3-butadiene and styrene do not contain any chiral centers.
- **Neoprene Monomer**: Chloroprene does not contain any chiral centers.
- **Nylon 6,6 Monomers**: Hexamethylenediamine and adipic acid do not contain any chiral centers.
- **PHBV Monomers**:
- 3-hydroxybutanoic acid has a chiral center at the carbon attached to the hydroxyl group (C2).
- 3-hydroxyvaleric acid also has a chiral center at the corresponding carbon.

3. **Conclusion**:
- The only polymer among the given options that has chiral monomers is **PHBV**. The monomers 3-hydroxybutanoic acid and 3-hydroxyvaleric acid both contain chiral centers.

### Final Answer:
The monomer of the polymer **PHBV** is chiral.

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