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Explain the following : (a) Boron has ...

Explain the following :
(a) Boron has high melting and boiling points.
(b) The `p pi - p pi` back bonding occurs in the halides of boron and not in those of aluminimum.
( c) Boron and aluminium halides behave as Lewis acids.
(d) Aluminium forms `[AlF_(6)]^(3-)` ion, but boron does not form `[BF_(6)]^(3-)` ion.

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