Mass Spectra Interpretation:
CARBOXYLIC ACIDS









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. 

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



    

    



     

      










    
    
    
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        a)
        
    29, 43
        
    



    

    

    
    
        b)
        
    45, 73
        
    



    

    

    
    
        c)
        
    none
        
    



    

    

    

    
    







    
    
        

        








     2. 

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



    

    



     

      










    
    
    
Click on image to enlarge


    		


    

    

    
    
        a)
        
    29, 43
        
    



    

    

    
    
        b)
        
    45, 73
        
    



    

    

    
    
        c)
        
    none
        
    



    

    

    

    
    







    
    
        

        








     3. 

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



    

    



     

      










    
    
    
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        a)
        
    2-propanoic acid
        
    



    

    

    
    
        b)
        
    hydrazine carboxylic acid, methyl ester
        
    



    

    

    
    
        c)
        
    butanoic acid
        
    



    

    

    
    
        d)
        
    2-methyl propanoic acid
        
    



    

    

    
    
        e)
        
    1-methoxy butane
        
    




    
    

    
    







    
    
        

        








     4. 

Choose the compound that this spectrum represents.
        
    
        



    

    



     

      










    
    
    
Click on image to enlarge


    		


    

    

    
    
        a)
        
    methyl formate
        
    



    

    

    
    
        b)
        
    acetic acid
        
    



    

    

    
    
        c)
        
    hydroxy acetonitrile
        
    



    

    

    
    
        d)
        
    2-propenoic acid
        
    



    

    

    
    
        e)
        
    butanoic acid
        
    




    
    

    
    







    
    
        

        








     5. 

Choose the compound that this spectrum represents.
        
    
        



    

    



     

      










    
    
    
Click on image to enlarge


    		


    

    

    
    
        a)
        
    butanoic acid, propyl ester
        
    



    

    

    
    
        b)
        
    heptanoic acid
        
    



    

    

    
    
        c)
        
    benzoic acid
        
    



    

    

    
    
        d)
        
    octanoic acid
        
    



    

    

    
    
        e)
        
    2-methyl propanoic acid
        
    




    
    

    
    







    
    
        

        








     6. 

Choose the compound that this spectrum represents.
        
    
        



    

    



     

      










    
    
    
Click on image to enlarge


    		


    

    

    
    
        a)
        
    cyclopentane carboxylic acid
        
    



    

    

    
    
        b)
        
    3,3-dimethyl-butanoic acid
        
    



    

    

    
    
        c)
        
    2-ethyl-butanoic acid
        
    



    

    

    
    
        d)
        
    benzoic acid
        
    



    

    

    
    
        e)
        
    2,2-dimethyl-butanoic acid
        
    




    
    

    
    







    
    
        

        








     7. 

Choose the compound that this spectrum represents.
        
    
        



    

    



     

      










    
    
    
Click on image to enlarge


    		


    

    

    
    
        a)
        
    2-methyl benzaldehyde
        
    



    

    

    
    
        b)
        
    benzoic acid
        
    



    

    

    
    
        c)
        
    heptanoic acid
        
    



    

    

    
    
        d)
        
    2-hydroxy benzaldehyde
        
    



    

    

    
    
        e)
        
    ethyl chloroacetate
        
    




    
    

    
    







    
    
        

        


















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