(i) Terelyne (also called dacron) is obtained from monomers, ethylene glycol, HO−CH2−CH2−OH and dimethylterephthalate, CH3−O−C(O)−C6H4−COOCH3
(ii) Nylon-6, 6 is obtained from monomers adipic acid, HOOC−(CH2)4−COOH and hexamethylene diamine, H2N−(CH2)6−NH2.