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Mass Spectral Problem MW 184: Distinguish Isomers


You are using mass spectrometry to distinguish between the two isomers below, each with molecular mass equal to 184 g/mol.

Image by Daniel J. Berger. Created for Copyright 2016. All rights reserved.

Which of the mass peaks listed would you expect to uniquely identify one of the two isomers?


Large peak at m/z 184, with another peak at m/ 186. The peak at 184 is three times the intensity of the peak at 186.


Large peak at m/z 169, with a peak $\frac{1}{3}$ as large at 171.


Large peak at m/z 153, with a peak $\frac{1}{3}$ as large at 155.


Large peak at m/z 149.