# Which of the following is an ambident ligand

$(a)\;CO\qquad(b)\;CN^-\qquad(c)\;H_2O\qquad(d)\;SO_4^{2-}$

A ligand is an ion or molecule that binds to a central metal atom to form a complex
Examples of electrically charged monodentate ligands are halide ions, such as: $F^-, Cl^-, Br^-, I^-$, and cyano, $CN^-$.
$CN^-$ is an ambident ligand
Hence (b) is the correct answer.
edited Nov 22