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Explain the following "The ppi-ppi bac...

Explain the following
"The `ppi-ppi` back bonding occurs in the halides of boron and not in those of aluminium".

Text Solution

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The tendency to show `ppi-ppi` back bonding depends on the size of central atom. This tendency decreases as the size of the central atom increases. Since Aluminium has larger size than boron,the back bonding is not possible.
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