Which of the following is thermosetting polymer?

Options

A. Buna-S
B. PVC
C. Bakelite
D. Plyethylene

Answer

To determine which of the following is a thermosetting polymer, we need to understand the characteristics of thermosetting polymers compared to thermoplastic polymers.

### Step-by-Step Solution:

1. **Definition of Thermosetting Polymers**:
- Thermosetting polymers are materials that, once cured or set, cannot be remolded or reshaped upon heating. This is due to their cross-linked structure, which makes them rigid and stable.

2. **Identify the Given Options**:
- The question mentions "the following" options, which are not provided here. However, common examples of polymers include Bakelite, PVC, Polystyrene, and Epoxy.

3. **Analyze Each Option**:
- **Bakelite**: Known to be a thermosetting polymer due to its highly branched and cross-linked structure. Once set, it cannot be melted or reshaped.
- **PVC (Polyvinyl Chloride)**: This is a thermoplastic polymer, which can be melted and reshaped multiple times.
- **Polystyrene**: Another example of a thermoplastic polymer that can be remolded upon heating.
- **Epoxy**: Generally classified as a thermosetting polymer, similar to Bakelite, due to its cross-linked structure.

4. **Conclusion**:
- Among the options, Bakelite is the most recognized thermosetting polymer. It cannot be reverted to its original form once it has been set.

### Final Answer:
- **Bakelite is a thermosetting polymer.**