A molecule containing which of the following atoms will produce M+• and (M+2)+• peaks of equal intensity?Select answer from the options belowBromine NitrogenChlorine Oxygen Carbon
Question
A molecule containing which of the following atoms will produce M+• and (M+2)+• peaks of equal intensity?Select answer from the options belowBromine NitrogenChlorine Oxygen Carbon
Solution
The correct answer is Bromine.
Bromine (Br) has two isotopes, 79Br and 81Br, that exist in approximately equal amounts in nature (50.69% and 49.31% respectively). When a molecule containing bromine is ionized in the mass spectrometer, it forms M+• and (M+2)+• peaks of roughly equal intensity due to these isotopes.
This is not the case for Nitrogen, Chlorine, Oxygen, or Carbon. For example, Chlorine (Cl) has two isotopes as well, 35Cl and 37Cl, but they do not exist in equal amounts (76.78% and 23.22% respectively), so the M+• and (M+2)+• peaks will not be of equal intensity. Nitrogen, Oxygen, and Carbon primarily exist as single isotopes (14N, 16O, and 12C), so they will not produce a (M+2)+• peak.
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