Why should one always use purest monomer in free radical polymerisation reaction ?

Explanation

### Step-by-Step Solution:

1. **Understanding Free Radical Polymerization**:
- Free radical polymerization is a process where free radicals initiate the polymerization of monomers to form long-chain polymers.
- A free radical is a highly reactive species with an unpaired electron.

2. **Role of Monomers**:
- Monomers are the building blocks of polymers. In free radical polymerization, the purity of the monomer is crucial for the success of the reaction.
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