The structures below show (on the left) an octahedral and (on the right) a trigonal prisma...

The structures below show (on the left) an octahedral and (on the right) a trigonal prismatic XY6 molecule.

(a)      To what point groups do these molecules belong?

(b) The bonding MOs in octahedral XY6 have a1g, es and tUl symmetries. Confirm that symmetries are consisent with the point group that you have assigned.

(c) Can there be a triply degenerate set of bonding orbitals for the trigonal prismatic XY6 molecule? rationalize you answer.