Classify the symmetry type of the d orbitals in a tetragonal C_4v symmetry complex, such as [CoCl(NH₃)₅]²⁺, where the Cl lies on the z-axis.

(a) Which orbitals will be displaced from their position in the octahedral molecular orbital diagram by π interactions with the lone pairs of the Cl⁻ ligand? 

(b) Which orbital will move because the Cl⁻ ligand is not as strong a σ base as NH₃? 

(c) Sketch the qualitative molecular orbital diagram for the C_4v complex.