Question

Suggest the reagents for the following conversion.

• A. Hg(OAc)₂, H₂O,NaBH₄
• B. B₂H₆/ether,H₂O,H₂O₂/OH^-
• C. H₂O/$H^{+}$
• D. Grignard reagent

Answer 1

The correct option is B

B₂H₆/ether,H₂O,H₂O₂/OH^-

Hydroboration-oxidation gives the less substituted alcohol as the major product, which is in accordance with the anti-Markovnikov's rule. Thus, a terminal alcohol will be obtained when boranes in ether or THF (tetrahydrofuran) along with alkaline hydrogen peroxide, is added to the given alkene.
A secondary alcohol will be formed on treatment with reagent (a) while reagent (c) will give a mixture of secondary and primary (minor product) alcohols.