What is formed through a reaction of (CH)C(CHOH) and Carbonyl Chloride?
Twinwall plastic:  Polycarbonate, which is most commonly formed through the reaction of Bisphenol A and Carbonyl Chloride, is an extremely versatile material. Bisphenol A: Bisphenol A (BPA) is an organic synthetic compound with the chemical formula (CH)C(CHOH) belonging to the group of diphenylmethane derivatives and bisphenols, with two hydroxyphenyl groups.
Polycarbonate