Answer
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Work Step by Step
Reacting BH$_{3}$ as reactant and THF with an alkene: Add H and BH$_{2}$ to the vinylic carbons. H is added to the more substituted carbon while BH$_{2}$ is added to the less substituted carbon.
The stereochemistry: H and BH$_{2}$ are added in syn fashion, meaning they are in the same plane.
Reacting H$_{2}$O$_{2}$ and OH$^{-}$, OH$^{-}$ will be substituted with BH$_{2}$ and retain its stereochemistry.