A molecule containing which of the following atoms will produce a (M+2)+• peak that is approximately equal to the intensity of the molecular ion peak?Select answer from the options belowSulfur NitrogenOxygenBromineChlorine
Question
A molecule containing which of the following atoms will produce a (M+2)+• peak that is approximately equal to the intensity of the molecular ion peak?Select answer from the options belowSulfur NitrogenOxygenBromineChlorine
Solution
The correct answer is Bromine.
Bromine (Br) has two isotopes: Br-79 and Br-81. They occur in approximately equal amounts in nature (50% each). Therefore, a molecule containing bromine will produce a (M+2)+• peak that is approximately equal to the intensity of the molecular ion peak.
This is because when a mass spectrum of a bromine-containing compound is taken, the molecular ion peak and the (M+2)+• peak will be of roughly equal intensity due to the equal natural abundance of the two isotopes.
The other elements listed (Sulfur, Nitrogen, Oxygen, Chlorine) do not have isotopes that occur in equal amounts in nature, so they will not produce a (M+2)+• peak of equal intensity to the molecular ion peak.
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