# Given the list of ligands and their corresponding names, choose the pair that disagree.

$\begin{array}{1 1}(a)\;LIGAND:OH^-,NAME:hydroxo\\(b)\;LIGAND:CN^-,NAME:cyanide\\(c)\;LIGAND:Cl^-,NAME:chloro\\(d)\;LIGAND:H_2O,NAME:aqua\end{array}$

LIGAND:$CN^-$,NAME:cyanide
Hence (b) is the correct answer.