In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of `Delta_o` be the highest?

Options

A. `[Co(C_(2)O_(4))_(3)]^(3-)`
B. `[Co(H_(2)O)_(6)]^(3+)`
C. `[Co(NH_(3))_(6)]^(3+)`
D. `[Co(CN)_(6)]^(3-)`

Answer

4

Explanation

Strength of ligands : `C_(2)O_(4)^(-2) lt H_(2)O lt NH_(3) lt CN^(-)`