Molecular Orbital Diagrams Questions

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(5 points) Sample qualitative assessment question: Which of the following is a possible MO diagram for formaldehyde (CH2O)?

  1. Draw the Lewis structure.
  2. Determine hybridization of each atom.
  3. Select ONE diagram, A, B, or C.
  4. Fill in electrons for molecular orbitals.
  5. Label σ, π, nonbonding (nb), σ*, and π* for each energy level.
  6. Assign the bond order for this species.

 

Lewis structure for CH2O:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

word image 2473

 

 

 

 

 

(5 points) Sample qualitative assessment question: Draw an MO diagram for CO2.

  1. Draw the Lewis structure.
  2. Determine hybridization of each atom.
  3. Relative energies of atoms in the small molecule are assigned below.
  4. Indicate relative energy levels of atomic and hybrid orbitals for each atom. Since there are two oxygen atoms, put all 8 orbitals for oxygen on the side of oxygen.
  5. Draw in molecular orbitals.
  6. Indicate which atomic and hybrid orbitals are mixing to form new molecular orbitals.
  7. Fill in electrons for molecular orbitals.
  8. Label σ, π, nonbonding (nb), σ*, and π* for each energy level.
  9. Assign the bond order for this species.

Lewis structure for carbon dioxide:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Carbon

 

 

 

 

 

 

 

 

Oxygen

 

 

 

 

(5 points) Sample qualitative assessment question: Draw an MO diagram for – CN (cyanide anion).

  1. Draw the Lewis structure.
  2. Determine hybridization of each atom.
  3. Relative energies of atoms in the small molecule are assigned below.
  4. Indicate relative energy levels of atomic and hybrid orbitals for each atom.
  5. Draw in molecular orbitals.
  6. Indicate which atomic and hybrid orbitals are mixing to form new molecular orbitals.
  7. Fill in electrons for molecular orbitals.
  8. Label σ, π, nonbonding (nb), σ*, and π* for each energy level.
  9. Assign the bond order for this species.

Lewis structure for cyanide anion:

 

 

 

 

 

 

 

 

Carbon

 

 

 

 

 

 

 

 

Nitrogen

 

 

 

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