(C) The $NO$ molecule is a unique ligand. While most ligands donate two electrons to the central metal atom,$NO$ can act as a three-electron donor in

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acts as a three-electron donor,unlike most ligands which donate two electrons.

(C) The $NO$ molecule is a unique ligand. While most ligands donate two electrons to the central metal atom,$NO$ can act as a three-electron donor in certain complexes (e.g.,in $[Fe(H_2O)_5(NO)]SO_4$),where it donates three electrons to the metal center.

Class 12 Chemistry Coordination Compounds Basic Terms

Medium

The $NO$ molecule,

A
acts as a one-electron donor,unlike most ligands which donate electrons.
B
acts as a two-electron donor,like most ligands.
C
acts as a three-electron donor,unlike most ligands which donate two electrons.
D
does not act as a donor.