Practice Questions for Mass Spectrometry

Question 1:
Which of the following compounds will give a molecular ion having m/z = an odd number?

CH3CH2OH
CH2BrCl
CH3CO2H
CH3CH2NH2
(CH3)2NCH2C≡N

Question 2:
What class of compounds is most likely to give a fragment ion at m/z = M-18?

alkenes
cycloalkanes
alcohols
alkyl iodides
benzene derivatives

Question 3:
Which of the following compounds is most likely to have its base peak at m/z = 43?

CH3(CH2)4CH3
(CH3)3CCH2CH3
cyclohexane
(CH3)2CHCH(CH3)2


            		 
This script written by William Reusch, Dept. of Chemistry, Michigan State University. Please send comments and corrections to whreusch@pilot.msu.edu.