Which of the following is not correctly matched ?

Options

A. Neoprene : `[-CH_(2)-underset(Cl)(C)=CH-CH_(2)-]_(n)`
B. Nylon-6,6: `[-NH-(CH_(2))_(6)-NH-CO(CH_(2))_(4)-overset(O)overset(||)(C)-]_(n)`
C.
D. Teflon: `[--CF_(2)-CF_(2)--]_(n)`

Explanation

To solve the question "Which of the following is not correctly matched?" regarding polymers and their structures, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are neoprene, nylon 6-6, pterylene, and Teflon. We need to check the structures associated with each polymer to determine if they are correctly matched.

2. **Examine Neoprene**:
- **Monomer Unit**: The monomer unit of neoprene is chloroprene (C4H5Cl).
- **Polymer Structure**: When n units of chloroprene polymerize, the structure formed is:
\[ \text{(CH}_2\text{-C(=CHCl)-)}_n \]
- **Conclusion**: The structure provided for neoprene matches with the expected structure. Thus, this option is correctly matched.

3. **Examine Nylon 6-6**:
- **Components**: Nylon 6-6 is made from hexamethylenediamine (NH2(CH2)6NH2) and adipic acid (HOOC(CH2)4COOH).
- **Polymer Structure**: The polymerization involves the condensation of these two components, leading to:
\[ \text{(NH(CH}_2\text{)}_6\text{NHCO(CH}_2\text{)}_4\text{CO)}_n \]
- **Conclusion**: The structure provided for nylon 6-6 matches with the expected structure. Thus, this option is also correctly matched.

4. **Examine Pterylene**:
- **Components**: Pterylene (or terephthalate) is made from ethylene glycol (HOCH2CH2OH) and terephthalic acid (C6H4(COOH)2).
- **Polymer Structure**: The polymerization leads to:
\[ \text{(O-CH}_2\text{CH}_2\text{-CO)}_n \]
- **Observation**: In the provided structure, one oxygen atom is missing from the expected structure of pterylene.
- **Conclusion**: This option is not correctly matched.

5. **Examine Teflon**:
- **Monomer Unit**: The monomer unit of Teflon is tetrafluoroethylene (CF2=CF2).
- **Polymer Structure**: When n units of tetrafluoroethylene polymerize, the structure formed is:
\[ \text{(CF}_2\text{-CF}_2\text{)}_n \]
- **Conclusion**: The structure provided for Teflon matches with the expected structure. Thus, this option is also correctly matched.

### Final Answer:
The polymer that is **not correctly matched** is **C: Pterylene**.

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