Dehydrohalogenation of vinyl halides is essentially an E2 process. A stereochemical study revealed that (Z)-2-chloro-2-butendioic acid reacted 50 times faster than its E stereoisomer. CO₂H H 1. Na+ NH2 2. H3O+ CO₂H For the reaction below: H Br 1. Na+ -NH2 2. H3O+ H Ph a Draw the structure of the major organic product. HO,C—C=C—CO,H