Answer to Question #26961 in Organic Chemistry for Jen
molecular structure for c5h10O
nmr: 9.8, 1.1
If you have a singlet way down at 9.8 ppm (1H) it's probably an aldehydic proton. If there are 9 equivalent hydrogens giving a singlet at 1.1 ppm, it must be a t-butyl group.