You are expected to identify which peaks on the mass spectrum of your product?Group of answer choicesThe molecular ion, M + 2, and M + 4 peaks.The peaks corresponding with the molecular ion, minus a bromine atomThe peak corresponding with the molecular ion minus two bromine atomsA, B, and C.
Question
You are expected to identify which peaks on the mass spectrum of your product?Group of answer choicesThe molecular ion, M + 2, and M + 4 peaks.The peaks corresponding with the molecular ion, minus a bromine atomThe peak corresponding with the molecular ion minus two bromine atomsA, B, and C.
Solution
You are expected to identify the following peaks on the mass spectrum of your product:
A. The molecular ion, M + 2, and M + 4 peaks. These peaks represent the molecular ion (the molecule as a whole) and its isotopes. The M+2 peak is due to the presence of isotopes that are 2 mass units heavier than the most abundant isotope, and the M+4 peak is due to isotopes that are 4 mass units heavier.
B. The peaks corresponding with the molecular ion, minus a bromine atom. This peak represents the molecule after losing a bromine atom during the ionization process in mass spectrometry. Bromine has two isotopes, 79Br and 81Br, so you would expect to see two peaks corresponding to the loss of each isotope.
C. The peak corresponding with the molecular ion minus two bromine atoms. This peak represents the molecule after losing two bromine atoms during the ionization process. Again, due to the isotopes of bromine, you would expect to see multiple peaks corresponding to the loss of two 79Br atoms, two 81Br atoms, or one of each.
So, the correct answer is D. A, B, and C. You are expected to identify all of these peaks on the mass spectrum of your product.
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