The correct order of the wavelength maxima of the absorption band in the ultraviolet-visible region for the given complexes is
- A${\left[ Co \left( NH _3\right)_5( Cl )\right]^{2+}<\left[ Co \left( NH _3\right)_5\left( H _2 O \right)\right]^{3+}<\left[ Co \left( NH _3\right)_6\right]^{3+}<\left[ Co ( CN )_6\right]^{3-}}$
- B${\left[ Co ( CN )_6\right]^{3-}<\left[ Co \left( NH _3\right)_6\right]^{3+}<\left[ Co \left( NH _3\right)_5\left( H _2 O \right)\right]^{3+}<\left[ Co \left( NH _3\right)_5( Cl )\right]^{2+}}$
- C${\left[ Co ( CN )_6\right]^{3-}<\left[ Co \left( NH _3\right)_5( Cl )\right]^{2+}<\left[ Co \left( NH _3\right)_5\left( H _2 O \right)\right]^{3+}<\left[ Co \left( NH _3\right)_6\right]^{3+}}$
- D${\left[ Co \left( NH _3\right)_6\right]^{3+}<\left[ Co ( CN )_6\right]^{3-}<\left[ Co \left( NH _3\right)_5( Cl )\right]^{2+}<\left[ Co \left( NH _3\right)_5\left( H _2 O \right)\right]^{3+}}$
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