Question

What is back bonding? explain why does it occur in boron halides and not in aluminium halides?

Answer 1

π back bonding, also called π back donation, is a concept from chemistry in which electrons move from an atomic orbital on one atom to an appropriate symmetry anti bonding orbital on a π-acceptor ligand. ... Electrons from the metal are used to bond to the ligand, in the process relieving the metal of excess negative charge.
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