How to decide whether a compound will show optical isomerism
In coordination compounds
I am giving you the summary of type of complexes that show optical isomerism.
The octahedral complexes of the type [Ma2b2c2] and [Mabcdef] are optically active where a,b,c,d,e and f are monodendate ligands.
The octahedral complexes of the type [M(A-A) 3]+n show optical isomerism where (AA) is a symmetrical bidendate ligand.Complexes of the type [M(A-A)2X2] also show optical isomerism. The cis form of this type of complex is optically active whereas trans form is optically inactive.Similarly the cis form of the complex [M(A-A)2BC]n+ is optically active. All 3 are shown below.
Complexes of the type [M(A-A)B2CD] also show optical isomerism. Complexes containing optically active ligands show optical isomerism.