Which of the following is not correctly matched?

Options

A. Neoprene:
`-(CH_(2)-overset(Cl)overset("| ")"C "=CH-CH_(2)-)_(n)`
B. Nylon - 66:
`-(NH-(CH_(2))_(6)-NH-Co-(CH_(2))_(4)-overset(O)overset(||)C)_(n)`
C.
D. Polymethyl methacrylate (PMMA):
`{:(" "CH_(3)),(" |"),((-CH_(2)-C-)_(n)),(" |"),(" "COOCH_(3)):}`

Answer

To solve the question of which compound is not correctly matched with its structure, we will analyze each option step by step.

### Step 1: Analyze Neoprene
- Neoprene is a type of synthetic rubber, and its structure is represented as:
\[ \text{(C}_4\text{H}_5\text{Cl)}_n \]
- The structure typically includes a repeating unit of chloroprene (2-chloro-1,3-butadiene).
- Since the structure given in the option matches this description, Neoprene is correctly matched.

**Hint:** Check if the structure corresponds to the repeating unit of the polymer.

### Step 2: Analyze Nylon 6-6
- Nylon 6-6 is a type of polyamide, and its structure is represented as:
\[ \text{NH(CH}_2\text{)6NHCO(CH}_2\text{)4CO)}_n \]
- The provided formula matches the known structure of Nylon 6-6.
- Thus, Nylon 6-6 is also correctly matched.

**Hint:** Look for the amide linkages and the carbon chain lengths in the formula.

### Step 3: Analyze Terylene
- Terylene, also known as PET (Polyethylene terephthalate), has the structure:
\[ \text{(C}_10\text{H}_8\text{O}_4)_n \]
- The correct structure shows two ester groups attached to a benzene ring. The option provided states that a CO group is attached to an adjacent carbon, which is incorrect.
- Therefore, Terylene is not correctly matched.

**Hint:** Identify the ester functional groups and their correct positions in the structure.

### Step 4: Analyze PMMA
- PMMA (Polymethyl methacrylate) has the structure:
\[ \text{(C}_5\text{H}_8\text{O}_2)_n \]
- The structure typically includes a methyl ester group attached to a polymer chain, which matches the description given in the option.
- Hence, PMMA is correctly matched.

**Hint:** Verify the presence of the ester group and the carbon backbone in the structure.

### Conclusion
After analyzing all the options, we conclude that the compound which is not correctly matched with its structure is **option C: Terylene**.

### Final Answer
**Option C: Terylene is not correctly matched.**

---