The complex ion having minimum magnitude of ( ₀(C F S E) ) is

Step-by-step solution

The magnitude of ( ₀ ) depends upon the type of ligands. For examples; strong field ligands have high magnitude of the ( ₀ ) and weak field ligands low magnitude of ( _ o ). Spectro chemical order of the ligands ( Cl ⁻ ( Cl ⁻ )is a weak field ligand, therefore, ( _ o ) will be minimum