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Binomial Nomenclature

Classify weak...

Question

Classify weak and strong ligands out of :
(a) $O H^{-}$ (b) $F^{-}$
(c) $I^{-}$ (d) $N H_{3}$
(e) $C H_{3} C O O^{-}$ (f) $e n$
(g) $C N^{-}$ (h) $C l^{-}$
(i) $H_{2} O$
$F^{-}, I^{-}, C l^{-}$ and $H_{2} O$ are weak ligands, other are strong lignads.
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Solution

$F^{-}, I^{-}, C l^{-}$ and $H_{2} O$ are weak ligands, whereas $O H^{-}$ , $N H_{3}$ , $C H_{3} C O O^{-}$ , $e n$ and $C N^{-}$ are strong lignads.

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(a)

H_{2} O

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B F_{3}

A I H_{3}

R O H

C H_{3} N H_{2}

C N^{-}

^{+} C H_{3}

Lewis acids : (c), (d), (e), (i)
Lewis bases : (a), (b), (f), (g), (h)
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Q. Transition metal complexes containing,

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H_{2} O

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is a strong ligand. Absorption takes place near

U V

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Q. Strong field ligands, such as

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Q. Based on VBT,

[F e C l_{6}]^{3 -}

C l^{-}

as weak ligands.

F e

s p^{3} d^{2}

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[F e (C N)_{6}]^{3 -}

C N^{-}

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F e

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