Write the names of the monomers of the following polymers:
`[CF_2 - CF_2 ]_n`

Explanation

To determine the monomers of the given polymer `[CF_2 - CF_2]_n`, we will follow these steps:

### Step 1: Identify the Polymer
The polymer `[CF_2 - CF_2]_n` is known as Teflon, which is the commercial name for polytetrafluoroethene.

### Step 2: Identify the Monomer
The monomer that forms Teflon is tetrafluoroethylene. The chemical structure of tetrafluoroethylene is represented as `CF2=CF2`, indicating that it contains a double bond between two carbon atoms, each bonded to two fluorine atoms.

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