What is the name of the polymer?

Teflon Nylon 6 Terylene Polyacrylonitrile

Terylene

The answer is (3) Terylene Dacron or terylene is the polycondensation product of benzene-1,4-dicarboxylic acid (terephthalic acid) and ethane-1,2-diol (ethylene glycol). Dacron or terylene is the best-known example of polyester.