State the monomer of Teflon.

Options

A. `CH_(2)=CH.Cl`
B. `CF_(2)=CF_(2)`
C. `CH_(2)=CH.CN`
D. `CH_(2)=underset(Cl)underset("|")C-CH=CH_(2)`

Answer

To determine the monomer of Teflon, we need to identify the chemical structure that polymerizes to form Teflon.

### Step-by-Step Solution:

1. **Understanding Teflon**: Teflon is a well-known polymer, specifically polytetrafluoroethylene (PTFE). To find its monomer, we need to look at the repeating unit that forms this polymer.

2. **Identifying the Monomer**: The chemical structure of Teflon is derived from the polymerization of tetrafluoroethylene. The chemical formula for tetrafluoroethylene is CF2=CF2.

3. **Recognizing the Structure**: The monomer has a double bond between the two carbon atoms, with each carbon atom bonded to two fluorine atoms. This can be represented as:
- CF2=CF2 (Tetrafluoroethylene).

4. **Conclusion**: Therefore, the monomer of Teflon (PTFE) is tetrafluoroethylene, which is represented by the formula CF2=CF2.

### Final Answer:
The monomer of Teflon is CF2=CF2.

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