Name the monomer and the type of polymerisation that takes place when PTFE is formed.

Explanation

To answer the question regarding the monomer and type of polymerization involved in the formation of PTFE (polytetrafluoroethylene), we can break it down into the following steps:

### Step-by-Step Solution:

1. **Identify the Monomer:**
- The monomer for PTFE is **tetrafluoroethylene**. This compound has the chemical formula C2F4, which consists of two carbon atoms and four fluorine atoms.

2. **Understanding the Structure of the Monomer:**
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