The complex that has highest crystal field splitting energy (Δ), is :
(1) K3 [Co(CN)6]
(2) [Co(NH3)5(H2O)]Cl3
(3) K2[CoCl4]
(4) [Co(NH3)5Cl]Cl2
The correct option (4) [Co(NH3)5Cl]Cl2
Explanation:
The field strength of ligand “CN” is high.