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 (A)</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 (A)</p> Signup and view all the answers

What is the energy of the chlorine 3p orbital?

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

What is the energy of the hydrogen 1s orbital?

<p>-13.6 eV (A)</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 (C)</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 (B)</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 (B)</p> Signup and view all the answers

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