【简答题】A molecule of fat (or oil) is made up of three molecules of an organic acid, called________________ , combined with one molecule of ________________ .
【简答题】The IR spectrum of an organic molecule,C4H8O,shows absorptions at 755,945,1080,1180,1370,1425,1725 and 2950cm-1.What is the probable structural formula for the molecule?