4.25 Describe the change in hybridisation (if any) of the atom in the following reaction.
Initially, the aluminium is in the ground state and the valence orbital can be shown as:
Then the electron gets excited so, the valence orbital can be shown as:
So, initially, aluminium was hybridisation and hence having a trigonal planar shape.
Then it reacts with chloride ion to form . Where it has the empty orbital which gets involved and the hybridisation changes from .
Hence there is a shape change from trigonal planar to tetrahedral.