How are polymers classified on the basis of structure ?

Explanation

**Step-by-Step Solution:**

Polymers can be classified based on their structure into three main types:

1. **Linear Polymers:**
- Definition: Linear polymers consist of long, straight chains of monomer units. These chains are unbranched and are connected end-to-end.
- Characteristics: They have a simple structure and are typically less complex than other types of polymers.
- Example: High-Density Polyethylene (HDPE) and Polyvinyl Chloride (PVC).
...