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NEET2011ChemistryCoordination CompoundsActual

Which one of the following complexes is outer orbital complex?

Options

  1. A[ Co ( NH ₃ )₆ ]³⁺
  2. B[ Mn ( CN )₆ ]⁴⁻
  3. C[ Fe ( CN )₆ ]⁴⁻
  4. D[ Ni ( NH ₃ )₆ ]²⁺

Correct answer

D. [ Ni ( NH ₃ )₆ ]²⁺

Step-by-step solution

Generally weaker field ligands form outer orbital complex. Between [ Co ( NH ₃ )₆ ]³⁺ and [ Ni ( NH ₃ )₆ ]²⁺ , the later form outer orbital complex because of its d^8 configuration. (The configuration of Co ³⁺=d^6 )

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