We should use purest monomer in free radical polymerisation. True/False.

Explanation

**Step-by-Step Solution:**

1. **Understanding Free Radical Polymerization**: Free radical polymerization is a method of polymer synthesis where free radicals initiate the polymerization process. The quality of the monomer used is crucial for the efficiency and outcome of this process.

2. **Importance of Monomer Purity**: The statement claims that we should use the purest monomer in free radical polymerization. This is true because impurities can significantly affect the polymerization process.

3. **Effects of Impurities**:
- **Chain Transfer Agents**: If the monomer contains impurities, these impurities can act as chain transfer agents. This means they can terminate the growing polymer chain prematurely, leading to lower molecular weight polymers.
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