Which of the following is not a thermoplastic ?

Options

A. Polythene
B. Bakelite
C. Nylon 6,6
D. Teflon

Answer

To determine which of the following options is not a thermoplastic, we need to analyze each option provided.

### Step-by-Step Solution:

1. **Understand Thermoplastics and Thermosetting Plastics**:
- Thermoplastics are polymers that can be melted and remolded multiple times without significant chemical change. They have weaker intermolecular forces.
- Thermosetting plastics, on the other hand, cannot be remolded after they have set. They have stronger intermolecular forces and are typically formed through a curing process.

2. **Analyze the Options**:
- **Option 1: Polythene**
- Polythene (Polyethylene) is a common thermoplastic. It can be melted and reshaped, making it a thermoplastic.
- **Option 2: Bakelite**
- Bakelite is a type of thermosetting plastic. Once it is set, it cannot be remolded or melted again. Therefore, it is not a thermoplastic.
- **Option 3: Nylon 66**
- Nylon 66 is a synthetic polymer that is classified as a thermoplastic. It can be melted and remolded.
- **Option 4: Teflon**
- Teflon (Polytetrafluoroethylene) is also a thermoplastic. It has a high melting point but can be melted and reshaped.

3. **Conclusion**:
- Among the options provided, Bakelite (Option 2) is the only one that is not a thermoplastic. Therefore, the answer to the question is **Option 2: Bakelite**.

### Final Answer:
**Option 2: Bakelite is not a thermoplastic.**