Hückel Molecular Orbital Theory
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Questions and Answers

What is necessary for two atomic orbitals to form effective molecular orbitals?

  • The AO's must have identical energies
  • The AO's must have compatible symmetry (correct)
  • The AO's must have identical shape
  • The AO's must have identical orientation

    • What is the effect of a larger value of SAB on HAB?

  • HAB decreases
  • HAB remains constant
  • HAB increases (correct)
  • HAB becomes zero

    • What is the result of the energies of EA and EB being significantly different?

  • The MO's will not differ significantly from the original AO's (correct)
  • The MO's will differ significantly from the original AO's
  • The MO's will become bonding
  • The MO's will become antibonding

    • Why were the s and p orbitals hybridized in carbon?

    <p>To increase the overlap of the charge clouds</p> Signup and view all the answers

    What is the rough criterion for the energies of EA and EB to form effective molecular orbitals?

    <p>EA and EB should be within about 0.2 hartree or 5 eV</p> Signup and view all the answers

    What is the energy of the chlorine 3p orbital?

    <p>-13.0 eV</p> Signup and view all the answers

    What is the energy of the hydrogen 1s orbital?

    <p>-13.6 eV</p> Signup and view all the answers

    What type of bond can be formed between the chlorine 3p orbital and the hydrogen 1s orbital?

    <p>σ-bond</p> Signup and view all the answers

    What is the reason for the formation of a strong bonding MO in HCl?

    <p>The energies of the chlorine 3p and hydrogen 1s orbitals are comparable</p> Signup and view all the answers

    What is the condition for the formation of a π-bond?

    <p>Both orbitals must be p-orbitals with the same orientation</p> Signup and view all the answers

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