1) draw structure for cholesterol & mark all chiral carbons
2) what functional groups are present in cholesterol? (& yes I tried googling it, so far I have alcohol, hydroxyl, steroid nucleus, and hydrocarbon tail)
3) you are trying to convert 3-penten-2-one to 3-penten-2-ol, but are out of sodium borohydride & aluminum borohydride. Suggest another method of carrying out the reduction of ketone using hydrogen gas.