Choose the correct statement(s).

Options

A. Tetrahedral complexes do not show geometrical isomerism beacause the realtive positions of the unidentate ligands attached to the central metal atom are the same with respect to each other
B. `[Co(en)_(3)]]^(3+)` has two stereoisomers both of which are optically active
C. `[Co(en)_(3)]^(2+)` has three stereoisomers out of which only two are optical isomers
D. `trans-[CrCl_(2)("ox")_(2)]^(3-)` is an optical isomer of `cis-[CrCl_(2)("ox")_(2)]^(3-)`

Answer

A, B

Explanation

`[PtCl_(2)("en")_(2)]^(2+) implies"trans"("optically inactive,meso form")=1`
cis (optically active)=2
meso is also an optical isomer.