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!)
        
    
        



    

    



     

      










    
    
    
Click on image to enlarge


    		


    

    

    
    
        a)
        
    29, 43	
        
    



    

    

    
    
        b)
        
    43, 57	
        
    



    

    

    
    
        c)
        
    none
        
    



    

    

    

    
    







    
    
        

        








     2. 

Find the alkyl LOSS ion series in the same spectra shown below.  (Check the hint!)
        
    
        



    

    



     

      










    
    
    
Click on image to enlarge


    		


    

    

    
    
        a)
        
    29, 43
        
    



    

    

    
    
        b)
        
    43, 57
        
    



    

    

    
    
        c)
        
    none
        
    



    

    

    

    
    







    
    
        

        








     3. 

For this same spectrum, choose the compound that the spectrum represents.
        
    
        



    

    



     

      










    
    
    
Click on image to enlarge


    		


    

    

    
    
        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.
        
    
        



    

    



     

      










    
    
    
Click on image to enlarge


    		


    

    

    
    
        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.
        
    
        



    

    



     

      










    
    
    
Click on image to enlarge


    		


    

    

    
    
        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!)
        
    
        



    

    



     

      










    
    
    
Click on image to enlarge


    		


    

    

    
    
        a)
        
    0
        
    



    

    

    
    
        b)
        
    1
        
    



    

    

    
    
        c)
        
    2
        
    



    

    

    
    
        d)
        
    3
        
    



    
    

    

    
    







    
    
        

        








     7. 

For this same spectrum, choose the compound that the spectrum represents.
        
    
        



    

    



     

      










    
    
    
Click on image to enlarge


    		


    

    

    
    
        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!)
        
    
        



    

    



     

      










    
    
    
Click on image to enlarge


    		


    

    

    
    
        a)
        
    0
        
    



    

    

    
    
        b)
        
    1
        
    



    

    

    
    
        c)
        
    2
        
    



    

    

    
    
        d)
        
    3
        
    



    
    

    

    
    







    
    
        

        








     9. 

For this same spectrum, choose the compound that the spectrum represents.
        
    
        



    

    



     

      










    
    
    
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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