Which of the following will produce M⁺• and (M+2)⁺• peaks of equal intensity?

Question

Quizplus · Accepted Answer

Bromine has a natural abundance of two isotopes, 79Br and 81Br. The (M+2) peak in mass spectrometry represents the presence of the heavier isotope, so if the (M+2) peak is of equal intensity to the MS peak, it indicates the presence of the heavier isotope in approximately 50% of the molecules. This can only occur in elements with multiple isotopes. Chlorine also has multiple isotopes, but nitrogen and oxygen do not have a significant enough difference in isotopic masses to produce a noticeable (M+2) peak. Therefore, the answer is C) bromine.

Which of the Following Will Produce M+• and (M+2)+• Peaks

Which of the Following Will Produce M⁺• and (M+2)⁺• Peaks