Which one of the following is an example of a thermosetting polymer?

Options

A. `-"("C_(2)H-underset(Cl)underset(|)C=CH-CH_(2)")"_(n)`
B. `-"("C_(2)H-underset(Cl)underset(|)C")"_(n)`
C. `-"("overset(H)overset(|)N-(CH_(2))_(6)-overset(H)overset(|)N-overset(O)overset(||)C-(CH_(2))_(4)-overset(O)overset(||)C")"_(n)`
D.

Explanation

To determine which one of the following is an example of a thermosetting polymer, we can follow these steps:

### Step 1: Understand the Types of Polymers
Polymers are classified into two main categories based on their behavior upon heating: thermoplastics and thermosetting polymers.

- **Thermoplastics**: These polymers can be melted and reshaped multiple times. They become soft when heated and harden upon cooling, allowing for recycling and reshaping.
- **Thermosetting Polymers**: These polymers undergo a chemical change when heated, which makes them hard and inflexible. Once set, they cannot be remolded or melted.

### Step 2: Identify Examples of Thermosetting Polymers
Common examples of thermosetting polymers include:
- Bakelite
- Melamine formaldehyde
- Epoxy resins

### Step 3: Analyze the Given Options
Now, let’s analyze the options provided in the question:
1. Neoprene rubber - This is a thermoplastic elastomer, not a thermosetting polymer.
2. PVC (Polyvinyl Chloride) - This is a thermoplastic polymer.
3. Nylon 6-6 - This is a synthetic fiber and is also a thermoplastic.
4. Bakelite - This is a well-known thermosetting polymer.

### Step 4: Conclusion
Based on the analysis, the correct answer is **Bakelite**, as it is an example of a thermosetting polymer.

### Final Answer
**Bakelite** is an example of a thermosetting polymer.

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