Which one of the following polymers is prepared by condensation...

Copolymer of adipic acid and hexamethylene diamine gives nylon 66. $n \mathrm{HOOC}\left(\mathrm{CH}_2\right)_4 \mathrm{COOH}+n \mathrm{H}_2 \mathrm{~N}\left(\mathrm{CH}_2\right)_6 \mathrm{NH}_2 \rightarrow$ Nylon 66 Related Theory Nylon-66 has high tenacity and elasticity. It is resistant to abrasion and not affected by sea water. It is used for reinforcement of rubber tyres, manufacture of parachute, safety belts, carpets and fabrics.