Indicate whether this ligand is pi accepter or pi donor 1.CN ion and defend your answer ?

CN ion is a pi acceptor ligand. This is because the nitrogen atom in the CN ion has a lone pair of electrons that can be donated to the metal center, making it a pi acceptor ligand.

Pi acceptor

Explanation:

The CN ion has a lone pair of electrons that it can donate to the metal center. However, it also has a triple bond between the carbon and nitrogen atoms, which makes it a strong pi acceptor. This means that it can accept electrons from the metal center's d orbitals into its pi- antibonding orbitals. This donation of electrons from the metal center into the CN ion's pi- orbitals strengthens the bond between the metal center and the CN ion.