For a substance to be optical isomer following conditions should be fulfiled
(a) A coordination compound which can rotate the plan of polarised light is said to be optically active.
(b) When the coordination compounds have sam formula but differ in their abilities to rotate directions o the plane of polarised light are said to exhibit optica isomerism and the molecules are optical isomers. Th optical isomers are pair of molecules which are non superimposable mirror images of cach other.
(c) This is due to the absence of elements of symmetry in the complex.
(d) Optica isomerismisexpectedin tetrahedral complexe of the type Mabod.
Based an this anly aption (b) shows optical isomerism
[Co(en)3]3+
Complexes of
Zn2+ cannot show optical isomerism as they are tetrahedral complexes with plane of symmetry.
[CO(H2O)4(en)]3+ has two planes of symmetry hence it is also optically inactive.