Which of the following is thermo setting polymer?

Options

A. Teflon
B. Bakelite
C. Polystyrene
D. Nylon-6

Explanation

To determine which of the following is a thermosetting polymer, we need to analyze each option provided:

1. **Understanding Thermosetting Polymers**:
- Thermosetting polymers are materials that, once set into a solid form through heat or chemical processes, cannot be remelted or reshaped. They have a three-dimensional network structure that makes them rigid and heat-resistant.

2. **Analyzing the Options**:
- **Option A: Teflon**
- Teflon is known as a thermoplastic polymer. It can be melted and reshaped multiple times. Therefore, it is not a thermosetting polymer.
- **Option B: Bakelite**
- Bakelite is a classic example of a thermosetting polymer. Once it is set through heat and pressure, it cannot be remelted or reshaped. This makes it a thermosetting polymer.
- **Option C: Polystyrene**
- Polystyrene is a thermoplastic polymer. It can be melted and reshaped, so it does not qualify as a thermosetting polymer.
- **Option D: Nylon 6**
- Nylon 6 is a type of synthetic polymer that is also classified as a thermoplastic. It can be melted and reformed, which means it is not a thermosetting polymer.

3. **Conclusion**:
- Among the options provided, **B: Bakelite** is the only thermosetting polymer.

### Final Answer:
**B: Bakelite**