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The p pi- p pi back bonding occurs in t...

The `p pi- p pi` back bonding occurs in the halides of boron and not in those of aluminium. Explain.

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The tendency to show `p pi - p pi` back bonding depends upon the size of central atom.
This tendency decreases as the size of the centrale atom in a group increases. Since aluminium has large size than boron, the back bonding is not possible.
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