Write the names of monomers of the following polymers:

(i) Hexamethylenediamine $\left[\mathrm{H}_{2} \mathrm{~N}-\left(\mathrm{CH}_{2}\right)_{6}-\mathrm{NH}_{2}\right]$ and adipic acid $\left[\mathrm{HOOC}-\left(\mathrm{CH}_{2}\right)_{4}-\mathrm{COOH}\right]$

(ii)

(iii) Tetrafluoroethene $\left(\mathrm{CF}_{2}=\mathrm{CF}_{2}\right)$