# Which of following is not an ambidentate ligand? Option 1) $NO_{2}^{-}$ Option 2) $CN^{-}$ Option 3) $SCN^{-}$ Option 4) CO

P Plabita

As we learnt in

Types of Ligands on the basis of Connectivity -

(i) Unidentate - ligand is bound to metal ion through a single donor atom.

eg: $Cl^{-}, H_{2}O and NH_{3}$

(ii) Bidentate : when ligand can bind through two donor atoms

eg: $CH_{2}NH_{2}-CH_{2}NH_{2}$

(iii) Polydentate - when ligand bind to two or more donor atoms

(iv) Hexadentate - type of polydentate having six donor atoms

(v) Ambidentate- which can ligate through two different atoms at a time

eg. $M\leftarrow SCN$ & $M\leftarrow NCS$

- wherein

All ambidentate ligands are monodentate but all monodentate ligands are not ambidentate

Ambidentate Ligands can ligate through two different atoms at a time.

Of all the given, CO is the only ligand which can donate only through one atom i.e. C

Option 1)

$NO_{2}^{-}$

This option is incorrect

Option 2)

$CN^{-}$

This option is incorrect

Option 3)

$SCN^{-}$

This option is incorrect

Option 4)

CO

This option is correct

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