Mass spectroscopy practice questions
1. Assume that you have two unlabeled samples, one of methylcyclohexane and the other of
ethylcyclopentane. How could you use mass spectrometry to tell them apart?
2. Two mass spectra are shown below. One spectrum is that of 2-methyl-2-pentene; the other is of
2-hexene. Determine the structure of each spectrum. Explain.
3. 2-Methylpentane (C6H14) has the mass spectrum shown. Which peak represents M? Which is the
base peak? Propose structures for fragment ions of m/z 71, 57, 43, and 29. Why does the base
peak have the mass it does?
4. Identify the compound from the mass spectrum based on the given compounds below.
CH3 CH3
CH3
OHCH3
O
CH4
CH3 CH3 CH3 CH3
O
OH2
NH3
CH3
CH3
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