option D
Explanation-
Pi-acidic ligands are ligands that have a relatively low-lying LUMO that has the appropriate symmetry to interact with a d-orbtal on the metal centre and the resultant molecular orbital formed will have pi-symmetry. For instance with CO (a classic pi-acidic ligand).
CO is a good pi acceptor (lewis acid) due to empty pi orbitals and a good sigma donor (lewis acid). When bonding to a metal the ligand (in this case CO) sigma donates to an empty d-orbital and the filled d-orbitals of the metal donates to the empty pi* orbitals of CO, back donation.
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option D
got this imdadul?
Yes Sir