Introduction to Structure Determination  
Combined: Introduction  
Introduction   Infrared   Ultraviolet   Mass Spectrometry   NMR   Crystallography   Combined  
 
  • Self Assessment Problems
    •
    After working through the theory and examples for each technique, you can now self assess your understanding of IR, NMR and UV / Visible spectroscopy and mass spectrometry. Complete the problems which contain information from several techniques on the same compound.

    Characteristic Chemical Shifts
    Characteristic Chemical Shifts
    Characteristic IR Absorption Frequencies
    1. A compound has a strong absorption near 1720 cm-1 in its infrared spectrum, no strong absorption in its UV spectrum and a parent ion at m/z 86 in its mass spectrum. Its 1H NMR spectrum is given below. Which of the structures below is consistent with these data.
     
     
    (a) 3-methylbutan-2-one   (b) propan-3-one
    (c) 2-methylbutanal   (d) 2-methylenebutan-1-ol
    (e) (E)-2-methylbut-2-en-1-ol   (f) (Z)-2-methylbut-1-en-1-ol



    (This question is for self assessment and your answer and score will not be recorded.)


    Jump to: Q2, Q3, Q4


     
     © Prof Adam Bridgeman, School of Chemistry, The University of Sydney, 2024