Q. Which method is most satisfactory for the conversion of 2-butene into 1-butanol?

1. Reaction with water and sulfuric acid.
2. Reaction with water and H3BO3
3. Reaction with B2H6,then reaction with hydrogen peroxide and potassium hydroxide
4. Reaction with B2H6,heat the reaction mixture,then reaction with hydrogen peroxide and potassium hydroxide.