OH " Problem #3 Provide the full IUPAC name for the following molecule: H3C . Problem #4 Below are the C and DEPT spectra of a compound with molecular formula C3H..0. Propose a structure for this compound and assign all signals. Dept 135 Dept 90 Dept 45 Carbon 200 190 180 170 160 150 140 130 120 110 90 80 70 60 50 40 30 20 10 100 ppm