Classify the following as addition and condensation
polymers : Terylene, Bakelite, polyvinyl chloride, polythene.

Explanation

To classify the given polymers (Terylene, Bakelite, polyvinyl chloride, and polythene) as addition or condensation polymers, we can follow these steps:

### Step 1: Understand the Definitions
- **Addition Polymers**: These are formed by the direct addition of monomer units without the loss of any small molecules (like water).
- **Condensation Polymers**: These are formed by the combination of two different monomer units with the elimination of a small molecule, usually water.

### Step 2: Identify Each Polymer
1. **Terylene**:
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