Pb set -3.docx - CHM 2120B – Fall 2018 Practice Problem...

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CHM 2120B – Fall 2018  Practice Problem Set -3  1.  For the compounds (a.-j.) indicate the number of distinct groups of equivalent protons:  2.  Considering the factors that influence the chemical shifts, explain the reason (s) behind this  difference in these following cases 3.  Identify the correct structures from the choices given below that would provide these information:   A-  Molecular formula : C H 1 A doublet at   1.25 ppm  δ A septet at   2.90 ppm   δ A multiplet at   7.25 ppm  δ IIIIIIIVV
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CHM 2120B – Fall 2018  B-  Molecular formula: C H 6 O,   10 4 1 H NMR spectrum:   A triplet at   1.0 ppm                                         δ A singlet at   1.4 ppm                                      δ A quartet at   1.6 ppm                                                         
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  • Fall '10
  • Dr.Flynn
  • δ, OH OH, 1700 cm, H O, a.  Propanoic, d.  Acetophenone

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