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

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

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

 Hence, it undergoes sp2 hybridization to give a trigonal planar arrangement (in AlCl3). To form AlCl4 – , the empty 3pz orbital also gets involved and the hybridization changes from sp2 to sp3 . As a result, the shape gets changed to tetrahedral. 

+1 vote
by (2.4k points)
Sp2 to Sp3 ....

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