Different sources have different answers. In the reduction of an aldehyde or ketone to an alcohol by Sodium Borohydride, how many moles of aldehyde are reduced by one mole of Sodium Borohydride?
While my teacher claims it is 1, Solomons-Fryhle claims it to be 4.
Your textbook is correct, or at least closer to correct. I have read in practice it's difficult to know the precise stoichiometry. But definitely more than one mole of aldehyde/ketone is reduced by one mole of NaBH4. In principle, the NaBH4 should act like a source of four hydrides.
