Mass Spectra Interpretation: KETONES


No. of Questions= 9

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 Find the alkyl ion series in the spectra below. (Check the hint!)
      Web Reference      
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a) 29, 43
b) 43, 57
c) none
2 Find the alkyl LOSS ion series in the same spectra shown below. (Check the hint!)
      Web Reference      
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a) 29, 43
b) 43, 57
c) none
3 For this same spectrum, choose the compound that the spectrum represents.
      Web Reference      
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a) 4-heptanone
b) 3-methyl-2-butanone
c) 3-pentanone
d) 2-butanone
e) 2-pentanone
4 Choose the compound that this spectrum represents.
      Web Reference      
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a) 2-heptanone
b) 4-heptanone
c) 3-pentanone
d) 4-methyl-2-heptanone
e) 2,4-dimethyl-3-pentanone
5 Choose the compound that this spectrum represents.
      Web Reference      
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a) cyclobutanone
b) 2-butanone
c) 2-propanone
d) 3-pentanone
e) 1-hydroxy-2-propanone
6 How many oxygens are in the molecular ion peak in this spectrum? (Check the hint!)
      Web Reference      
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a) 0
b) 1
c) 2
d) 3
7 For this same spectrum, choose the compound that the spectrum represents.
      Web Reference      
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a) 4-methyl-cyclohexanone
b) 2,4-pentanedione
c) 2-hexanone
d) 3,3-dimethyl-2-butanone
e) cyclohexanone
8 In this spectrum, the molecular ion is 98 and there is one oxygen atom. Calculate the number of rings + double bonds in this compound. (Check the hint!)
      Web Reference      
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a) 0
b) 1
c) 2
d) 3
9 For this same spectrum, choose the compound that the spectrum represents.
      Web Reference      
Click on image to enlarge
a) 3-methyl-2-butanone
b) 2-hexanone
c) 4-methyl-3-penten-2-one
d) 3-methyl-2-pentanone
e) cyclohexanone





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