The synthesis sequence shown here is best described as which of the following?
(1) Hydrogenation; (2) halogenation; (3) dehydration
(1) Dehydration; (2) hydrogenation; (3) halogenation
(1) Hydrogenation; (2) dehydration; (3) halogenation
(1) Dehydration; (2) halogenation; (3) hydrogenation