Knowing what to look for with respect to isotopic clusters can aid in interpreting mass spectra. How many peaks would you expect to see for the molecular ion in each of the following compounds? At what m/z values would these peaks appear? (Disregard the small peaks due to ¹3C and 2H.) (a) p-Dichlorobenzene (b) o-Dichlorobenzene (c) p-Dibromobenzene (d) p-Bromochlorobenzene

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Chapter12: Structure Determination: Mass Spectrometry And Infrared Spectroscopy
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Organic Chemistry 2 - 14.27

Problem 14.27
Knowing what to look for with respect to isotopic clusters can aid in interpreting mass
spectra. How many peaks would you expect to see for the molecular ion in each of the
following compounds? At what m/z values would these peaks appear? (Disregard the small
peaks due to ¹3C and 2H.)
13
Sample Solution (a) The two isotopes of chlorine are 35Cl and 37 Cl. There will be three
isotopically different forms of p-dichlorobenzene present. They have the structures shown as
follows. Each one will give an Mt peak at a different value of m/z.
37 Cl
35 Cl
35 Cl
(a) p-Dichlorobenzene
(b) o-Dichlorobenzene
35
'CI
m/z 146
37 C
m/z 148
(c) p-Dibromobenzene
(d) p-Bromochlorobenzene
37 Cl
m/z 150
Transcribed Image Text:Problem 14.27 Knowing what to look for with respect to isotopic clusters can aid in interpreting mass spectra. How many peaks would you expect to see for the molecular ion in each of the following compounds? At what m/z values would these peaks appear? (Disregard the small peaks due to ¹3C and 2H.) 13 Sample Solution (a) The two isotopes of chlorine are 35Cl and 37 Cl. There will be three isotopically different forms of p-dichlorobenzene present. They have the structures shown as follows. Each one will give an Mt peak at a different value of m/z. 37 Cl 35 Cl 35 Cl (a) p-Dichlorobenzene (b) o-Dichlorobenzene 35 'CI m/z 146 37 C m/z 148 (c) p-Dibromobenzene (d) p-Bromochlorobenzene 37 Cl m/z 150
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