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1H NMR Spectroscopy Identification and Differentiation
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1H NMR Spectroscopy Identification and Differentiation

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Questions and Answers

How would you use 1H NMR spectroscopy to distinguish between the following compounds?

  • Compound I will have a doublet, a septet, two triplets, and a sextet.
  • The compounds will have different numbers of signals.
  • Compound I will have two doublets, two triplets, and a multiplet. (correct)
  • Compound II will have a doublet, a multiplet, a quartet, and a triplet.

    • Which of the structures shown is consistent with a compound with a molecular formula C8H15ClO3?

  • II III IV I (correct)
  • III I V IV II
  • II III I V
  • None of these

    • Which one of the given compounds has the lowest wavenumber for its carbonyl absorption?

  • V (correct)
  • IV
  • III
  • I

    • Why would the absorption in a 13C NMR spectrum become a narrow peak instead of a broad peak?

    <p>Increased signal intensity</p> Signup and view all the answers

    Why does bromine produce M+ and (M+2)+ peaks of equal intensity on a mass spectrum?

    <p>Isotopic distribution of bromine isotopes</p> Signup and view all the answers

    Which compound is consistent with showing absorptions at 1640 cm-1, 2950 cm-1, and 3050 cm-1 on an IR spectrum?

    <p>Compound V</p> Signup and view all the answers

    Which compound among the options has a molecular formula C9H10O2 based on the 1H NMR spectrum provided?

    <p>II</p> Signup and view all the answers

    In the 1H NMR spectrum shown, which compound is most likely to display a Jac value of 6.5 Hz?

    <p>IV</p> Signup and view all the answers

    For the compound with a molecular formula C5H11NO, which absorption peak would be expected in the IR spectrum?

    <p>3400 cm-1</p> Signup and view all the answers

    Among the compounds provided, which one is most likely to exhibit only two singlets in its 1H NMR spectrum?

    <p>V</p> Signup and view all the answers

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