Question

Why is geometrical isomerism not possible in tetrahedral complexes having two different types of unidentate ligands coordinated with the central metal ion ?

Answer 1

1) For geometrical isomerism, the relative position of unidentate ligands attached to central metal atom shall be unequal.

2)In case of tetrahedral complex, the positons of the unidentate ligands are identical with respect to each other and hence show optical isomerism and not geometric.