Answer:
Top = H₂SO₄, H₂O or H₃O⁺
Middle = 1.) Hg(OAc)₂, H₂O
2.) NaBH₄
Bottom = 1.) BH₃ · THF
2.) H₂O₂, NaOH
Step-by-step explanation:
In the top reaction, the alcohol is being added to the most substituted carbon in the entire molecule. The top reaction could use H₂SO₄, H₂O as the reagents or H₃O⁺ as the reagent.
In the middle reaction, the alcohol is being added to the most substituted carbon included in the double bond. Hg(OAc)₂ is the shorthand way of representing mercury (II) acetate.
In the the bottom reaction, the alcohol is being added to the least substituted carbon included in the double bond.