Question

Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value. 

Choose the correct option : 

(1) A < B < C < D 

(2) B < A < C < D 

(3) B < C < D < A 

(4) C < D < B < A

Answer 1

Answer is (2) B < A < C < D

(i) CFSE ∝ charge or oxidation no. of central metal ion. 

(ii) CFSE ∝ strength of ligand

en > NH₃ > H₂O > F^– 

∴ order of CFSE