Which of the following is a condensation polymer ?

Options

A. Teflon
B. PVC
C. Polyester
D. Neoprene

Explanation

To determine which of the given options is a condensation polymer, we need to understand the definition and characteristics of condensation polymers. Here’s a step-by-step solution to the question:

### Step 1: Understand the Definition of Condensation Polymers
Condensation polymers are formed through a condensation reaction between two or more monomers, resulting in the release of small molecules such as water (H2O), methanol (CH3OH), or ammonia (NH3) as by-products.

### Step 2: Analyze Each Option
We will analyze each of the given options to identify if they are condensation polymers.

#### Option 1: Teflon (PTFE)
- **Composition**: Teflon is made from the monomer tetrafluoroethene (CF2=CF2).
- **Polymerization**: It undergoes addition polymerization, where n units of tetrafluoroethene combine without the release of any small molecules.
- **Conclusion**: Teflon is **not** a condensation polymer.

#### Option 2: PVC (Polyvinyl Chloride)
- **Composition**: PVC is made from the monomer vinyl chloride (CH2=CHCl).
- **Polymerization**: Like Teflon, PVC also undergoes addition polymerization, where n units of vinyl chloride combine without releasing any by-products.
- **Conclusion**: PVC is **not** a condensation polymer.

#### Option 3: Polyester (e.g., Pterylene)
- **Composition**: Pterylene is formed from the monomers ethylene glycol and terephthalic acid.
- **Polymerization**: During the polymerization of these monomers, water molecules are released as by-products.
- **Conclusion**: Polyester is a **condensation polymer**.

#### Option 4: Neoprene
- **Composition**: Neoprene is made from the monomer chloroprene (CH2=CCl-CH=CH2).
- **Polymerization**: Neoprene undergoes addition polymerization, similar to Teflon and PVC, without the release of any small molecules.
- **Conclusion**: Neoprene is **not** a condensation polymer.

### Final Answer
After analyzing all the options, the only condensation polymer among the given choices is **polyester**.

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