Three complexes ${[CoCl {({NH}_{3})}_{5}]}^{2 +}$ (I), ${[Co {({NH}_{3})}_{5} H_{2} O]}^{3 +}$ (II), and ${[Co {({NH}_{3})}_{6}]}^{3 +}$ (III) absorb light in the visible region. The correct order of the wavelength of light absorbed by them is:

$(III) > (I) > (II)$

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$(I) > (II) > (III)$

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$(II) > (I) > (III)$

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$(III) > (II) > (I)$

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Solution

The correct option is B
$(I) > (II) > (III)$

Explanation for the correct option:
(B) $(I) > (II) > (III)$
Ligands
Ligand is an ion or molecule that donates a pair of electrons to the metal atom to form a coordination complex.
Ligands are classified into Strong field ligands, Weak field ligands, and Neutral ligands
Field of the ligand is categorized based on the spectrochemical series.
The wavelength of Light absorbed by the complex
Strong field ligand tends to absorb light at the highest energy.
Higher the energy of light, the lesser the wavelength.
Strength of ligand: ${NH}_{3} > H_{2} O > {Cl}^{-}$
${[CoCl {({NH}_{3})}_{5}]}^{2 +}$ has weak field ligand and absorbs light of least energy and has the highest wavelength
${[Co {({NH}_{3})}_{5} H_{2} O]}^{3 +}$ has weak field ligand and absorbs light of least energy and has the highest wavelength
${[Co {({NH}_{3})}_{6}]}^{3 +}$ has strong field ligand and absorbs light of highest energy and has the least wavelength.
Explanation for the incorrect options:
The correct order of the wavelength of light absorbed by them is $(I) > (II) > (III)$ . Thus, options A, C, and D are incorrect.
Therefore, Option (B) $(I) > (II) > (III)$ is correct.

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Three complexes CoClNH352+(I), CoNH35H2O3+(II), and CoNH363+(III) absorb light in the visible region. The correct order of the wavelength of light absorbed by them is:

Three complexes ${[CoCl {({NH}_{3})}_{5}]}^{2 +}$ (I), ${[Co {({NH}_{3})}_{5} H_{2} O]}^{3 +}$ (II), and ${[Co {({NH}_{3})}_{6}]}^{3 +}$ (III) absorb light in the visible region. The correct order of the wavelength of light absorbed by them is: