Teflon is a polymer of which monomer,or how is Teflon obtained by the polymerisation of which compound?

Buna-$N$ synthetic rubber is a copolymer of ........

Identify the monomer of the polymer represented by the following structure:

Which among the following pairs of monomers does not generate a polyamide polymer?

$C_6H_6O$ (phenol) $\xrightarrow[\text{3}H_2\text{ (High temp and pressure)}]{Ni} (A)$ $\xrightarrow{Cu} (B)$ $\xrightarrow{NH_2OH} (C)$ $\xrightarrow{H^{+}} (D)$ $\xrightarrow{HO^{-}} (E)$
Product $(E)$ is

The polymer used for making contact lenses for eyes is