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Question:

The complex that has the highest crystal splitting energy (Δ) is:

[Co(NH3)3(H2O)]Cl3

K3[Co(CN)6]

[Co(NH3)2(H2O)]Cl3

[Co(NH3)5Cl]Cl2

Solution:

Crystal Field Theory -According to this theory, metal and ligand are considered as point charges. This theory deals with electrostatic force of attraction means the talks about the ionic character of M-L bond.As complex K3[Co(CN)6] have CN⁻ ligand which is a strong field ligand amongst the given ligand in other complexes.