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Homework Help: NMR problems please help

  1. Mar 17, 2016 #1
    • Thread moved from the technical forums, so no Homework Help Template is shown
    How many NMR signals and peaks will there be for a di-substituted benzene ring and why?
    The ring has one CH3 and and a Cl ortho to the CH3.

    (This isnt a homework problem but Im running into same issue whenever I encounter rings wrt NMR)

    i am specifically confused as to how to apply the n+1 rule to determine the number of peaks, with respect to two chemically equivalent protons.

    But first the signals

    On the above example, I think there will be 3 signals:
    the 3 chemically equivalent methyl protons = signal 1
    the 2 chem equiv protons on either side of the Cl = the 2nd signal
    the 2 chem equiv protons on either side of the methyl = the 3rd signal

    Before I ask about peaks, could someone tell me if this is correct so far?

  2. jcsd
  3. Mar 17, 2016 #2


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    Science Advisor
    2017 Award

    You say that the methyl is ortho to the chlorine, but from the description of the protons, it sounds like you're talking about p-chlorotoluene where the groups are para to each other. Which is correct?
  4. Mar 18, 2016 #3
  5. Mar 18, 2016 #4
    Sorry not sure why i said ortho, yup i definitely meant para..heres drawing so its clear
  6. Mar 18, 2016 #5
    please ignore that little grey dot above the ring.. no idea what that is (just learning chemdoodle).. thanks
  7. Mar 18, 2016 #6


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    Staff: Mentor

    Three kinds of protons sounds right.
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