What is the repeating unit of $\text{Teflon}$?

Solution

1. $\text{Teflon}$ is the common name for $\text{polytetrafluoroethylene}$ ($\text{PTFE}$).
2. It is synthesized by the free radical polymerization of $\text{tetrafluoroethene}$ (${\text{CF}}_2={\text{CF}}_2$).
3. The repeating unit is $-{\text{(CF}}_2{\text{-CF}}_2{\text{)}}_n-$.
4. Hence the answer is (A).