need help with 1-3 please

Write-Up Sheet for Reduction by Sodium Borohvdride Fvnnai... 2) What was your percent yield for the synthesis of recrystallized meso-hydrobenzoin? (Show your calculations). 3) When you first added the NaBH4 to the reaction mixture, gas bubbles most likely evolved. What was this gas and how was it formed? (In other words, show by means of a reaction scheme what led to the formation of this gas)