The addition of mercuric acetate in the presence of water is called oxymercuration. The adduct obtained gives alcohol on reduction with
NaBH4 in alkaline medium. This is known as demercuration. Oxymercuration-demercuration allows Markownikoff's addition of H, OH without rearrangement. The net result is the addition of
H2O.
Based on the above information, find product A in the given reaction.