Question

Here how many ligands are ambidentate?
$CN^{-},ONO^{-},S_{2}O_{3}^{2 -},CNO^{-},C_{2}O_{4}^{2 -},CH_{3}COO^{-}, \, en$

Answer 1

Here $\text{CN}^{-} \text{,} \, \text{ONO}^{-} \text{,} \, \text{S}_{\text{2}} \text{O}_{\text{3}}^{\text{2} -} \text{,} \, \text{CNO}^{-}$ are ambidentate ligands.
$M \leftarrow AB$ and $M \leftarrow BA$