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Q. Among the following, the $\pi$-acid ligand is

KVPYKVPY 2010Coordination Compounds

Solution:

The $\pi$-acid ligands are those ligands, which have filled orbitals that can donate electrons to metals and also have empty anti-bonding orbitals, which can also accept electrons from the central metals. Among the given options $CN$ is a $\pi$-acid ligand.