Which of the following is not correctly matched

Options

A. `{:("Nylon"-6,,,,"polyamide"):}`
B. `{:(Buna-S,,,,"Co-polymer"):}`
C. `{:("Bakelite",,,,"Thermoplastic"):}`
D. `{:("Polythene",,,,"Addition polymer"):}`

Answer

To determine which of the following pairs is not correctly matched, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Options**:
- We are given four pairs to evaluate. Let's denote them as:
1. Nylon 6 - Polyamides
2. Buna S - Copolymer
3. Bakelite - Thermoplastic
4. Polythene - Addition Polymer

2. **Evaluate Each Pair**:
- **Pair 1: Nylon 6 - Polyamides**
- Nylon 6 is indeed a polyamide, as it contains amide linkages in its structure. This pair is correctly matched.

- **Pair 2: Buna S - Copolymer**
- Buna S is a copolymer made from two different monomers (butadiene and styrene). This pair is also correctly matched.

- **Pair 3: Bakelite - Thermoplastic**
- Bakelite is actually a thermosetting polymer, not a thermoplastic. It is formed from the polymerization of phenol and formaldehyde and cannot be remolded after it has set. Therefore, this pair is not correctly matched.

- **Pair 4: Polythene - Addition Polymer**
- Polythene is formed through the addition of ethylene monomers, making it an addition polymer. This pair is correctly matched.

3. **Conclusion**:
- The only pair that is not correctly matched is **Bakelite - Thermoplastic**. Bakelite is a thermosetting polymer.

### Final Answer:
The pair that is not correctly matched is **Bakelite - Thermoplastic**.

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