The molecule above is sent through a mass spectrometer. Which of the following is the chemical species represented by a peak at m/z 43?
A. methyl carbocation
B. ethyl carbocation
C. propyl carbocation
D. butyl carbocation
Click for Explanation
Each of the carbocations listed would have a charge of +1. Thus the species with a m/z of 43 would simply be the one with the mass closest to 43. Here, that’s choice (C).
A: A methyl group has a mass of approximately 15
B: An ethyl group has a mass of approximately 29
D: A butyl group has a mass of approximately 56
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