Alcohols are converted to tosylates by treatment with p-toluence sulfonyl chloride (TsCl) in the presence of pyridine. This overall process converts a poor leaving group `(overset(Ө)H)` into good one `(overset(Ө)Ts)`. A tosylate is a good leaving group its conjugates acid p-touence sulfonic acid is strong acid. Beacuse alkyl tosylates have food leaving groups, they undergo both nucleophilic substitution and `beta-"elimination"`.
Idetify the final product of the following sequences of reactions:
A.
B.
C.
D.
