Describe and draw the structure of: (a) nylon, a polyamide (b) PET, a polyester The full name for PET, polyethylene terephthalate, is not required

Describe the substitution reaction of alkanes with chlorine as a photochemical reaction, with ultraviolet light providing the activation energy, E_a, and draw the structural or displayed formulae of the products, limited to monosubstitution