The magnitude of `Delta_(0)` will be highest in which of the following complex.

Options

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

Explanation

(a) The crystal field splitting. `Delta_(0)` depends upon the field produced by the ligand and charge on the metal ion. In all these complexes of chromium charge, acquried by metal ion is +3. "therefore " `Delta_(0)` depends upon the field produced by the ligand, In aaccordance with the spectrochemical series, the increasing order of field strngth is
`C_(2)O_(4)^(2-)ltH_(2)OltNH_(3)ltCN^(-)`
Thus, `CN^(-)` is the strong. field ligand and will prodcue, highest magnitude of `Delta_(0)`