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Which of the following is a pair of ambidentate ligands?
- CN⁻ and NO2⁻
- NO3⁻ and SCN⁻
- N3⁻ and NO2⁻
- NCS⁻ and C2O4²-
Correct answer: CN⁻ and NO2⁻
Solution
An ambidentate ligand is one that can coordinate to the metal through two different atoms. CN⁻ can bind via C (isocyanide linkage) or N (cyanide). NO2⁻ can bind via N (nitro: M-NO2) or O (nitrito: M-ONO). Both are therefore ambidentate ligands. SCN⁻ is also ambidentate (through S or N). NO3⁻ donates only through O, and C2O4²- donates through both O atoms but from the same functional group (it is a chelating but not ambidentate ligand). Option A (CN⁻ and NO2⁻) is the correct pair of ambidentate ligands.
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