$[IrF_3 (H_2O)_2(NH_3)] $; Hyb. $:$ $d^2sp^3;$ exhibits geometrical isomerism but does not exhibit optical isomerism.
$[NiCl_2(en)_2]$ ; Hyb. $:$ $sp^3d^2;$ exhibits both geometrical isomerism and optical isomerism.
$[Co(CN)_2(ox)_2]^{3-}$ ; Hyb. $: d^2sp^3 ;$ exhibits both geometrical isomerism and optical isomerism.
$A: \left[ Ni ( en )_{3}\right]^{2+}, B :\left[ Ni \left( NH _{3}\right)_{6}\right]^{2+}, C :\left[ Ni \left( H _{2} O \right)_{6}\right]^{2+}$
$(en = NH_2CH_2CH_2NH_2)$