Which one of the following is not a condensation polymer?

Options

A. Melamine
B. Glyptal
C. Dacron
D. Neoprene

Explanation

To determine which of the following is not a condensation polymer, we need to analyze each option provided in the question. Condensation polymers are formed through the reaction of two different bifunctional monomers, resulting in the elimination of a small molecule, such as water or methanol.

### Step-by-Step Solution:

1. **Identify the Types of Polymers**:
- Understand the difference between condensation polymers and addition polymers. Condensation polymers form through the combination of monomers with the release of a small molecule, while addition polymers form without the loss of any small molecules.

2. **Examine Each Option**:
- **Malamine**:
- Formed from melamine and formaldehyde. This reaction involves the elimination of water, thus it is a condensation polymer.
- **Glyptol**:
- Formed from ethylene glycol and phthalic acid. This also involves the elimination of water, making it a condensation polymer.
- **Dacron**:
- Formed from ethylene glycol and terephthalic acid. Similar to the previous examples, this reaction releases water, classifying it as a condensation polymer.
- **Neoprene**:
- Formed from the free radical polymerization of chloroprene. This process does not involve the elimination of any small molecules, which categorizes it as an addition polymer.

3. **Conclusion**:
- After analyzing all the options, we find that neoprene is the only polymer that does not fit the definition of a condensation polymer. Therefore, the answer to the question is **neoprene**.

### Final Answer:
**Neoprene is not a condensation polymer.**

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