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Homework Help: Spectroscopy questions

  1. Nov 15, 2007 #1
    I have done a few Spectroscopy questions already, However I am having troble with these last three problems. Any help would be GREAT!
    Here is the link tothe spectroscopy questions.
    On worksheet 6b, I need help on #1 and #2.
    On worksheet 6a I need help on #4.

    http://chemistry.usf.edu/faculty/data/weldegirma/files/worksheet6-2210L.pdf [Broken]
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Nov 15, 2007 #2
    Well I personally have no clue on the problem unless you can show us any work you have done on those problems...
  4. Nov 16, 2007 #3


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    6B, #1 is too easy. What functional group do you know of that will give you a sharp singlet (proton spectrum) way down at 11.5 ppm? Treat the group of peaks at 0.9 and 2.3 ppm as triplets and the absorbance at 1.6 ppm as a multiplet. The C13 spectrum has a carbon way down at 180 ppm. Four types of carbon are present.

    #2 is also easy. You have a singlet way down at 11 ppm. Treat the absorbance at 1ppm as a doublet and the multiplet at 2.4 as a quartet. The C13 spectrum has a carbon way down at 205 ppm. Only three types of carbon are present in roughly a 2:1:1 ratio.

    6A, #4 can be divined by the proton spectrum alone. Three carbons with three types of protons. One is a triplet at the typical place you find methyl groups next to methylene protons. Nuff said...
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