The correct order of the wavelength of light absorbed by the following complexes is, A. [Co(NH_3)_6]^3+ B. [Co(CN)_6]^3- C. [Cu(H_2 O)_4]^2+ D. [Ti(H_2 O)_6]^3+ Choose the correct answer from the options given below:

Coordination Compounds PYQ — NEET 2025 · Q125 with Solution

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Correct answer: D

$$\begin{aligned} & \lambda \propto \frac{1}{\text { strength of ligand }} \\ & \lambda \propto \frac{1}{\text { splitting }} \end{aligned}$$

A. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}\quad$; 475 nm

B. $\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-} \quad ; \quad 310 \mathrm{~nm}$

C. $\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+} \quad ; \quad 600 \mathrm{~nm}$

D. $\left[\mathrm{Ti}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+} \quad ; \quad 498 \mathrm{~nm}$

Order of $\lambda=\mathrm{C}>\mathrm{D}>\mathrm{A}>\mathrm{B}$

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Correct answer: D

$$\begin{aligned} & \lambda \propto \frac{1}{\text { strength of ligand }} \\ & \lambda \propto \frac{1}{\text { splitting }} \end{aligned}$$

A. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}\quad$; 475 nm

B. $\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-} \quad ; \quad 310 \mathrm{~nm}$

C. $\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+} \quad ; \quad 600 \mathrm{~nm}$

D. $\left[\mathrm{Ti}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+} \quad ; \quad 498 \mathrm{~nm}$

Order of $\lambda=\mathrm{C}>\mathrm{D}>\mathrm{A}>\mathrm{B}$