Question

Which of the following can act as both monodentate and bidentate ligand?

• A. $S{O}_4^{2-}$
• B. $H_{2}O$
• C. $C{N}^{-}$
• D. None of the above

Answer 1

The correct option is A $S{O}_4^{2-}$

$H_{2}O$ and $C{N}^{-}$ are monodentate ligand.
$S{O}_4^{2-}$ is a flexidentate ligand. A ligand that shows flexible denticity is called flexidentate ligand.
$S{O}_4^{2-}$ can act as both monodentate and bidentate ligand.