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 understand what Teflon is and its chemical structure.

### Step-by-Step Solution:

1. **Identify Teflon**: Teflon is a well-known polymer, specifically polytetrafluoroethylene (PTFE). It is widely used for its non-stick properties and chemical resistance.

2. **Understand the Structure**: The structure of Teflon consists of a long chain of carbon atoms, each bonded to fluorine atoms. The repeating unit in the polymer chain is derived from a specific monomer.

3. **Determine the Monomer**: The monomer that forms Teflon is tetrafluoroethylene. The chemical formula for tetrafluoroethylene is C2F4, which can also be represented as CF2=CF2. This compound has two carbon atoms, each bonded to two fluorine atoms.

4. **Polymerization Process**: When tetrafluoroethylene undergoes polymerization, the double bond between the carbon atoms opens up, allowing the formation of long chains of Teflon. This process can be represented as:
\[ n \, \text{CF}_2=\text{CF}_2 \rightarrow -\text{CF}_2-\text{CF}_2- \text{CF}_2- \ldots - \]
where 'n' indicates the number of repeating units.

5. **Conclusion**: Therefore, the monomer of Teflon is tetrafluoroethylene (CF2=CF2).

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

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