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JEE Main levelSingle correct optionDifficulty 2 of 3cc135

Which pair consists only of ambidentate ligands?

A $Cl X^{-}$ and $Br X^{-}$
B $en$ and $NH X_{3}$
C $C X_{2} O X_{4} X^{2 -}$ and $en$
D $SCN X^{-}$ and $NO X_{2} X^{-}$

Answer: D

SCN X^{-}

binds through S or N and

NO X_{2} X^{-}

binds through N or O, so both are ambidentate. en and oxalate are bidentate with one kind of donor, and halides and

NH X_{3}

have one donor atom only.

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