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JEE Advanced2025ChemistryCoordination CompoundsActual

The correct order of the wavelength maxima of the absorption band in the ultraviolet-visible region for the given complexes is

Options

  1. A[ Co ( CN )₆ ]³⁻ < [ Co ( NH ₃ )₆ ]³⁺ < [ Co ( NH ₃ )₅ ( H ₂ O ) ]³⁺ < [ Co ( NH ₃ )₅( Cl ) ]²⁺
  2. B[ Co ( NH ₃ )₅( Cl ) ]²⁺ < [ Co ( NH ₃ )₅ ( H ₂ O ) ]³⁺ < [ Co ( NH ₃ )₆ ]³⁺ < [ Co ( CN )₆ ]³⁻
  3. C[ Co ( CN )₆ ]³⁻ < [ Co ( NH ₃ )₅( Cl ) ]²⁺ < [ Co ( NH ₃ )₅ ( H ₂ O ) ]³⁺ < [ Co ( NH ₃ )₆ ]³⁺
  4. D[ Co ( NH ₃ )₆ ]³⁺ < [ Co ( CN )₆ ]³⁻ < [ Co ( NH ₃ )₅( Cl ) ]²⁺ < [ Co ( NH ₃ )₅ ( H ₂ O ) ]³⁺

Correct answer

A. [ Co ( CN )₆ ]³⁻ < [ Co ( NH ₃ )₆ ]³⁺ < [ Co ( NH ₃ )₅ ( H ₂ O ) ]³⁺ < [ Co ( NH ₃ )₅( Cl ) ]²⁺

Step-by-step solution

_ O 1 aligned & The absorb wave length order is & [ Co ( CN )₆ ]³⁻ < [ Co ( NH ₃ )₆ ]³⁺ < [ Co ( NH ₃ )₅ H ₂ O ]³⁺ < [ Co ( NH ₃ )₅ Cl ]²⁺ aligned

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