Tutorial 2 : Valence Bond Theory and Molecular Orbital Theory CHM361

1. Consider the SCl6 molecule.

(i) Describe the hybridization process of the central atom for the molecule using Valenve bond theory.

(ii) State the type of hybridization of the central atom.(iii) Sketch and name the molecular geometry.

2. Two 2py atomic orbitals overlap to form molecular orbitals.

(i) Sketch and name the type of molecular orbital formed.(ii) Which of the molecular orbitals that you drawn in (i) is more stable than the 2py atomic

orbitals?(iii) Sketch and name the type of molecular orbital formed when 2px atomic orbital overlap.

3. Draw a completely labeled molecular orbital energy level diagram for F2 and F2-. Compare these

species in terms of :(i) Bond length(ii) Bond strength(iii) Bond energy

4. Construct a molecular orbital energy level diagram for nitrogen gas.

(i) Find bond order.(ii) Predict the magnetic property of the gas.(iii) State HOMO and LUMO for this molecule.(iv) Write the electronic configuration for nitrogen gas.

5. Consider the molecule O2 and the ion O22-.

(i) Construct and label the MO energy level diagram for both species.(ii) State the magnetism of O2 and O2

2-.(iii) In which species is the O-O bond stronger, O2 or O2

2? Explain your answer in terms of bond order. Is that bond longer or shorter?

(iv) State the HOMO and LUMO for both species.(v) Draw the orbital diagram for HOMO and LUMO in (iv).

6. For the molecules below, sketch and name the hybrid orbitals of the central atoms and name the geometries.(i) BrCl5

(ii) BF3

(iii) CO32-