Question
The correct order of the wavelength of light absorbed by the following complexes is,
A. $\left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack^{3 +}$
B. $\left\lbrack Co(CN)_{6} \right\rbrack^{3 -}$
C. $\left\lbrack Cu\left( H_{2}O \right)_{4} \right\rbrack^{2 +}$
D. $\left\lbrack Ti\left( H_{2}O \right)_{6} \right\rbrack^{3 +}$
Choose the correct answer from the options given below:
Options
Solution
Sol. [Key Concept: Order of wavelength of light absorbed by complexes (CFSE / Δₒ)]
$\ \lambda \propto \frac{1}{\text{~}\text{strength of ligand}\text{~}}$
$$\lambda \propto \frac{1}{\text{~}\text{splitting}\text{~}} $$A. $\left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack^{3 +}\ ;\ 475\text{ }nm$
B. $\left\lbrack Co(CN)_{6} \right\rbrack^{3 -}\ ;\ 310\text{ }nm$
C. $\left\lbrack Cu\left( H_{2}O \right)_{4} \right\rbrack^{2 +}\ ;\ 600\text{ }nm$
D. $\left\lbrack Ti\left( H_{2}O \right)_{6} \right\rbrack^{3 +}\ ;\ 498\text{ }nm$
Order of $\lambda = C > D > A > B$
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