Choose incorrect stability order:

Options

A. `[Cu(NH_(3))_(4)]^(2+) lt [Cu(en)_(2)]^(2+) lt [Cu("trien")]^(2+)`
B. `[Fe(H_(2)O)_(6)]^(3+) lt [Fe(NO_(2))_(6)]^(3-) lt [Fe(NH_(3))_(6)]^(3+)`
C. `[Co(H_(2)O)_(6)]^(3+) lt [Rh(H_(2)O)_(6)]^(3+) lt [Ir(H_(2)O)_(6)]^(3+)`
D. `[Cr(NH_(3))_(6)]^(1+) lt [Cr(NH_(3))_(6)]^(2+) lt [Cr(NH_(3))_(6)]^(3+)`

Answer

B

Explanation

`[Fe(H_(2)O)_(6)]^(3+) lt [Fe(NO_(2))_(6)]^(3-) lt [Fe(NH_(3))_(6)]^(3+)`
`NO_(2)^(-)` is stronger ligand than `NH_(3)`.