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(C) The energy of absorbed light is inversely proportional to the wavelength $(E = \frac{hc}{\lambda})$.Therefore,the complex that absorbs light of ma

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$[Cu(H_2O)_4]^{2+}$

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(C) The energy of absorbed light is inversely proportional to the wavelength $(E = \frac{hc}{\lambda})$.Therefore,the complex that absorbs light of maximum wavelength must have the minimum crystal field splitting energy $(\Delta_o)$.According to the spectrochemical series,the strength of ligands is $Cl^- Stronger ligands cause larger splitting $(\Delta_o)$.Comparing the complexes:$1$. $[Co(CN)_6]^{3-}$ has strong $CN^-$ ligands,leading to high $\Delta_o$.$2$. $[Co(NH_3)_6]^{3+}$ has $NH_3$ ligands,leading to moderate $\Delta_o$.$3$. $[CoCl(NH_3)_5]^{2+}$ has a weak $Cl^-$ ligand,which reduces the overall $\Delta_o$ compared to $[Co(NH_3)_6]^{3+}$.$4$. $[Cu(H_2O)_4]^{2+}$ involves a $3d^9$ system with $H_2O$ ligands,which generally exhibits a smaller $\Delta_o$ value compared to the $Co^{3+}$ complexes mentioned.Among the given options,$[Cu(H_2O)_4]^{2+}$ has the smallest crystal field splitting energy,corresponding to the maximum wavelength of absorbed light.

List-$I$ (Coordination entity)	List-$II$ (Wavelength of light absorbed in $nm$)
$A$. $[CoCl(NH_3)_5]^{2+}$	$I$. $310$
$B$. $[Co(NH_3)_6]^{3+}$	$II$. $475$
$C$. $[Co(CN)_6]^{3-}$	$III$. $535$
$D$. $[Cu(H_2O)_4]^{2+}$	$IV$. $600$

Which among the following complexes is associated with the maximum wavelength of light absorbed?

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Which of the following order of $CFSE$ is incorrect?

The color of $[Ti(H_2O)_6]^{3+}$ is due to:

Identify the correct decreasing order of wavelength of light absorbed for the following complex ions:
$I. [Co(H_2O)_6]^{3+}$
$II. [Co(CN)_6]^{3-}$
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$IV. [Co(en)_3]^{3+}$

Arrange the following complex ions in increasing order of crystal field splitting energy $(\Delta_{0}):$ $[Cr(Cl)_{6}]^{3-}, [Cr(CN)_{6}]^{3-}, [Cr(NH_{3})_{6}]^{3+}$

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