(i) We know, terylene is a polyester, and a polyester is a polymer having the ester linkage.
Terylene also known as Dacron is prepared by the condensation polymerization reaction of two monomers – Ethylene glycol and Terepthalic acid. Condensation reaction involves the loss of a simple molecule like NH3, H2O, HCl, etc(here, H2O is removed).
(ii) Nylon-6,6 is a copolymer of hexamethylenediamine and adipic acid through condensation polymerisation. The polymerisation type is named such because after the end of the reaction a simple molecule(here, H2O) is released.
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