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The wavelength of light absorbed is highest in
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$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}^{2+}\right.$
As in complex $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right]^{2+}$ unpaired electrons are present, so it requires less energy for excitation. Thus, the wavelength of light absorbed will be highest (i.e., $E \propto 1 / \lambda$ ).
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