Predict the 13C NMR spectrum of the 3-ethylpentane. A. How many signals would you expect? 13C NMR signals B. In the chart, fill in the expected chemical shift and splitting pattern for the proton coupled 13C NMR spectrum. The signal at 15ppm is observed to be twice as large as the others. Deduce the structure of an unknown compound using the data. C5H10O : NMR: 9.8(1H,s),1.1(9H,s)