Three complexes,
[CoCl(NH3)5]2+ (I)
[Co(NH3)5H2O]3+ (II) and
[Co(NH3)6]3+ (III)
absorb light in the visible region. The correct order of the wavelength of light absorbed by them is:1
(III) > (I) > (II)
2
(III) > (II) > (I)
3
(II) > (I) > (III)
4
(I) > (II) > (III)