Identify compounds A, B, and C from the following information and explain the chemistry that is taking place. Reaction of the alcohol shown in the margin with 4-methylbenzenesulfonyl chloride in pyridine produced A (C15H20O3S). Reaction of A with lithium diisopropylamide (I.DA Section 7-8) produces a single product. B (C8H12), which displays m its 1H NMR a two-proton multiplet at about δ = 5.6 ppm. If however, compound A is treated with Nal before the reaction with LDA two products are formed: B and an isomer, C, who's NMR shows a multiplet at δ = 5.2 ppm that integrates as only one proton.