Which one of the following is not a vinyl polymer

Options

A. PVC
B. polystrene
C. polyacrylonitrile
D. PTFE

Answer

To determine which of the following is not a vinyl polymer, we need to analyze each option based on their monomeric units. Vinyl polymers are typically derived from vinyl monomers, which contain the vinyl group (–CH=CH2).

### Step-by-step Solution:

1. **Identify the Options:**
- PVC (Polyvinyl Chloride)
- Polystyrene
- Polyacrylonitrile
- PTFE (Polytetrafluoroethene)

2. **Analyze PVC (Polyvinyl Chloride):**
- The monomer for PVC is vinyl chloride (CH2=CHCl).
- Since it contains the vinyl group, PVC is a vinyl polymer.

3. **Analyze Polystyrene:**
- The monomer for polystyrene is styrene (C6H5-CH=CH2).
- It also contains the vinyl group, making polystyrene a vinyl polymer.

4. **Analyze Polyacrylonitrile:**
- The monomer for polyacrylonitrile is acrylonitrile (CH2=CH-CN).
- It contains the vinyl group as well, so polyacrylonitrile is also a vinyl polymer.

5. **Analyze PTFE (Polytetrafluoroethene):**
- The monomer for PTFE is tetrafluoroethylene (CF2=CF2).
- Although it has a similar structure, it does not contain the traditional vinyl group (–CH=CH2) as it has fluorine atoms instead of hydrogen.
- Therefore, PTFE is not classified as a vinyl polymer.

6. **Conclusion:**
- The option that is not a vinyl polymer is **PTFE (Polytetrafluoroethene)**.

### Final Answer:
**PTFE (Polytetrafluoroethene)** is not a vinyl polymer.