The crystal field -splitting for `Cr^(3+)` ion in octahedral field changes for ligands `I^(-),H_(2)O,NH_(3),CN^(-)` and the increasing order is :

Options

A. `I^(-) lt H_(2)O lt NH_(3) lt CN^(-)`
B. `CN^(-) lt I^(-) lt H_(2)O lt NH_(3)`
C. `CN^(-) lt NH_(3) lt H_(2)O lt I^(-)`
D. `NH_(3) lt H_(2)O lt I^(-) lt CN^(-)`

Answer

A

Explanation

(1) The crystal field-splitting for `Cr^(3+)` ion in octahedral field increases with increasing strength of ligands. This order given in (1) is according to spectrochemical series.