b) How many peaks will one see in proton and carbon NMR spectra of this molecule? Draw an approximate proton spectrum where you show the expected position and multiplicity for the each observed peak (8p) ? 3. Using mass-spectrometry to distinguish between the following three compounds-A. 1,3-diethyl-5-methylbenzene, B. m-ethylpropylbenzene, and C. 2-methyl-2-phenylpentane. a) Give full structure for the three compounds (6 points) b) Would you expect these compounds to have different molecular ions in El (electron impact) mass-spectra? Explain. (2 points) c) Draw structure of the two significant fragmentation peaks expected for each of these compounds. Explain how it can help to tell apart these three compounds (9 Points)