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JEE Main202126 Aug 2021Evening ShiftChemistryCoordination CompoundsActual

Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value. Complexes: CoF 6 3 - A , Co H 2 O 6 2 + B , Co NH 3 6 3 + C and Co ( en ) 3 3 + D Choose the correct option :

Options

  1. AB < C < D < A
  2. BB < A < C < D
  3. CA < B < C < D
  4. DC < D < B < A

Correct answer

B. B < A < C < D

Step-by-step solution

CFSE ∝ Strength of ligand   en > NH 3 > H 2 O > F - CFSE ∝ Oxidation number of the central metal. ∴ Order of CFSE Co H 2 O 6 2 + < CoF 6 3 - < Co NH 3 6 3 + < Co ( en ) 3 3 +

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