A molecule containing which of the following atoms will produce a (M+2)+• peak that is approximately 1/3 the intensity of the molecular ion peak?Select answer from the options belowOxygenSulfur ChlorineBromineNitrogen
Question
A molecule containing which of the following atoms will produce a (M+2)+• peak that is approximately 1/3 the intensity of the molecular ion peak?Select answer from the options belowOxygenSulfur ChlorineBromineNitrogen
Solution
The correct answer is Chlorine.
Chlorine has two isotopes, Cl-35 and Cl-37, in approximately a 3:1 ratio. This means that about 1/3 of chlorine atoms in a sample will be Cl-37, which is 2 mass units heavier than Cl-35.
So, in a mass spectrum, a molecule containing chlorine will produce a (M+2)+• peak that is approximately 1/3 the intensity of the molecular ion peak. This is because about 1/3 of the molecules will contain the heavier Cl-37 isotope.
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