Introduction to Structure Determination  
Combined: Self Assessment Problems  
Introduction   Infrared   Ultraviolet   Mass Spectrometry   NMR   Crystallography   Combined  
 
  • Self Assessment Problems
    •
    Characteristic Chemical Shifts
    Characteristic Chemical Shifts
    Characteristic IR Absorption Frequencies
    4. A compound of molecular formula C9H10O2 has a strong absorption in the ultraviolet spectrum around 265 nm, and strong absorptions in the infrared spectrum at 1670 cm-1 and 2900 cm-1. The mass spectrum and 13C NMR spectrum are given below. Which of the structures below best fits these data.
     


    mass spectrum



    13C NMR    		  
    (a) 2,3-dimethylbenzoic acid   (b) 3,4-dimethylbenzoic acid
    (c) 3,5-dimethylbenzoic acid   (d) 1-(4-methoxyphenyl)ethanone
    (e) p-tolyl acetate   (f) methyl 4-methylbenzoate



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


    Jump to: Q1, Q2, Q3


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