Mass Spectra Interpretation: ALKANES


No. of Questions= 7

ELECTRON IMPACT MASS SPECTROMETRY PRODUCED THE SPECTRA BELOW. MANY PEAKS ARE LABELLED TO AID INTERPRETATION: M/Z (RELATIVE ABUNDANCE).

LOOK AT THE HINTS AND FOLLOW THE WEB REFERENCE LINK FOR HELP. YOU WILL NEED A PERIODIC TABLE, A TABLE OF COMMON ISOTOPES (WHICH YOU CAN FIND IN THE WEB REFERENCE), A CALCULATOR, AND SCRATCH PAPER TO WORK THIS QUIZ.


1 The molecular ion in the spectrum below is 58. What alkyl group was lost to form the intense fragment at m/z 43?
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a) methyl (CH3)
b) ethyl (CH3CH2)
c) propyl (CH3CH2CH2)
2 For this same spectrum, choose the compound that the spectrum represents.
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a) 2-methyl butane
b) butane
c) pentane
d) cyclobutane
e) 1-butene
3 The highest cluster of peaks in a spectrum may contain the molecular ion and its isotope peak(s). In the spectrum below, how many carbons are represented by the molecular ion peak 72 and its isotope peak 73?
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a) 3
b) 4
c) 5
d) 6
4 For this same spectrum, choose the compound that the spectrum represents.
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a) hexane
b) 1-pentene
c) 2-methyl pentane
d) 2,2-dimethyl propane
e) pentane
5 Choose the compound that this spectrum represents.
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a) 2,2-dimethyl pentane
b) 2-methyl hexane
c) heptane
d) 3,3-dimethyl butane
e) octane
6 Choose the compound that this spectrum represents.
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a) octane
b) 2,2-dimethyl pentane
c) 2-methyl hexane
d) 3,3-dimethyl butane
e) heptane
7 Choose the compound that this spectrum represents.
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a) 3-methyl pentane
b) 2,2-dimethyl butane
c) heptane
d) hexane
e) 2-methyl pentane





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