. Describe the change hybridization (if any) of the Al atom in the following reaction

AlCl3 + Cl– →  AlCl-4

Best Answer

Answer: The valence orbital picture of aluminum in the ground state can be represented as:


The orbital picture of aluminum in the excited state can be represented as


Hence, it undergoes sp2 hybridization to give a trigonal planar arrangement (in AlCl3). To form  , the empty 3pz orbital also gets involved and the hybridization changes from sp2 to sp3. As a result, the shape gets changed to tetrahedral.

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