IB Chemistry DP Spectroscopic Identification Quiz
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IB Chemistry DP Spectroscopic Identification Quiz

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Questions and Answers

What does the Index of Hydrogen Deficiency (IHD) provide information about?

  • The mass of a molecule in comparison to its saturated counterpart
  • The number of oxygen and sulfur atoms in a molecule
  • The number of hydrogen molecules needed to convert a molecule to the corresponding saturated, non-cyclic molecule (correct)
  • The number of carbon atoms in a molecule

    • How is the IHD calculated for a compound containing CxHy?

  • (2x+2-y)/2 (correct)
  • (2x-y)/2
  • (x+y)/2
  • (x+2y)/2

    • Which atoms are ignored when using the IHD formula?

  • Hydrogen and halogen atoms
  • Carbon and hydrogen atoms
  • Oxygen and sulfur atoms (correct)
  • Nitrogen and carbon atoms

    • What is the purpose of counting halogens as hydrogen in the IHD formula?

    <p>To account for their similar properties to hydrogen atoms</p> Signup and view all the answers

    How is the degree of unsaturation related to the IHD?

    <p>The degree of unsaturation is another term for IHD</p> Signup and view all the answers

    What is the Index of Hydrogen Deficiency for ethyne, C$_2$H$_2$?

    <p>2</p> Signup and view all the answers

    What is the Index of Hydrogen Deficiency for methylbenzene, C$_6$H$_5$CH$_3$?

    <p>4</p> Signup and view all the answers

    Which peak in a mass spectrum gives information about the molecular mass of a compound?

    <p>Molecular ion (M+) peak</p> Signup and view all the answers

    How can the structure of an unknown compound with the same molecular mass as another be further determined?

    <p>By analyzing its fragmentation patterns in the mass spectrum</p> Signup and view all the answers

    What does the [M+1] peak in a mass spectrum depend on?

    <p>Number of carbon atoms present in the molecule</p> Signup and view all the answers

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