How many of these polymers are condensation polymers?
Nylonn - 6, 6, Dacron, Bakelite, Teflon, Buna - N, Nylon - 6, Glyptal, Polythene

Answer

To determine how many of the given polymers are condensation polymers, we need to analyze each polymer and identify whether it is formed through condensation or addition polymerization.

### Step-by-Step Solution:

1. **Identify the Polymers**: The polymers provided are:
- Nylon 6,6
- Dacron
- Bakelite
- Teflon
- Buna-N
- Nylon 6
- Glyptal
- Polythene

2. **Define Condensation Polymers**: Condensation polymers are formed by the reaction of monomers with the elimination of small molecules such as water (H2O) or methanol (CH3OH).

3. **Analyze Each Polymer**:
- **Nylon 6,6**: Formed from hexamethylenediamine and adipic acid with the elimination of water. **(Condensation Polymer)**
- **Dacron**: Formed from ethylene glycol and terephthalic acid with the elimination of water. **(Condensation Polymer)**
- **Bakelite**: Formed from phenol and formaldehyde with the elimination of water. **(Condensation Polymer)**
- **Teflon**: Formed from tetrafluoroethylene through addition polymerization. **(Not a Condensation Polymer)**
- **Buna-N**: Formed from acrylonitrile and butadiene through addition polymerization. **(Not a Condensation Polymer)**
- **Nylon 6**: Formed from caprolactam with the elimination of water. **(Condensation Polymer)**
- **Glyptal**: Formed from ethylene glycol and phthalic acid with the elimination of water. **(Condensation Polymer)**
- **Polythene**: Formed from ethylene through addition polymerization. **(Not a Condensation Polymer)**

4. **Count the Condensation Polymers**:
- The condensation polymers identified are:
- Nylon 6,6
- Dacron
- Bakelite
- Nylon 6
- Glyptal
- Total = 5 condensation polymers.

### Final Answer:
There are **5 condensation polymers** among the given list.

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