The correct order for the wavelength of absorption in the visible region is

Options

A. `[Ti(NO_(2))_(6)]^(3-) lt[Ti(NH_(3))_(6)]^(3+) lt[Ti(H_(2)O)_(6)]^(3+)`
B. `[Ti(NO_(2))_(6)]^(3-) lt[Ti(NH_(2)O)_(6)]^(3+) lt[Ti(NH_(3))_(6)]^(3+)`
C. `[Ti(H_(2)O)_(6)]^(3+) lt[Ti(NH_(3))_(6)]^(3+) lt[Ti(NO_(2))_(6)]^(3-)`
D. `[Ti(NH_(3))_(6)]^(3+) lt[Ti(H_(2)O)_(6)]^(3+) lt[Ti(NO_(2))_(6)]^(3-)`

Answer

A

Explanation

The presence of weak field ligands make the central metal ion to absob low energies i.e., of higher wavelength. The field strangth of ligands can be obtained from spectrochemical series. i.e. (weak field) `I^(-)lt Br^(-)ltS^(2-)ltCl^(-)ltNO_(3).^(-)ltF^(-)ltOH^(-)ltH_(2)OltNH_(3)ltNO_(2-)ltCN^(-)ltCO` (strong field)