The correct order of the wavelength maxima of the absorption band in the…

Chemistry · JEE Advanced · NTA ExamsCoordination Compounds

The correct order of the wavelength maxima of the absorption band in the ultraviolet-visible region for the given complexes is
  1. [Co(CN)6]3− < [Co(NH3)6]3+ < [Co(NH3)5(H2O)]3+
    < [Co(NH3)5(Cl)]2+
  2. [Co(NH3)5(Cl)]2+ < [Co(NH3)5(H2O)]3+
    < [Co(NH3)6]3+ < [Co(CN)6]3−
  3. [Co(CN)6]3− < [Co(NH3)5(Cl)]2+
    < [Co(NH3)5(H2O)]3+ < [Co(NH3)6]3+
  4. [Co(NH3)6]3+ < [Co(CN)6]3− < [Co(NH3)5(Cl)]2+
    < [Co(NH3)5(H2O)]3+

Answer

(C) [Co(CN) 6 ] 3− 3 ) 5 (Cl)] 2+ 3 ) 5 (H 2 O)] 3+ 3 ) 6 ] 3+

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