Identify the correct order of wavelength of light absorbed for the following complex ions:
$\begin{matrix} [C o (H_{2} O)_{6}]^{3 +}; & [C o (C N)_{6}]^{3 -}; & [C o (I)_{6}]^{3 -}; & [C o (e n)_{3}]^{3 +} I & I I & I I I & I V \end{matrix}$

III > I > IV >II

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II > IV > I >III

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III > I > II >IV

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I > III > IV >II

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Solution

The correct option is A III > I > IV >II
Order of $Δ_{0}$ for ligands is $C N^{-} > e n > H_{2} O > I^{-}$
So, order of wavelength will be in the reverse order.

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