(a) If the com plex MA2B2 is sp3 hybridised then the shape of this complex is tetrahedral this structure is opticaly inactive due to the presence of plane of symmetry.
Optical isomes = 0 (b) If the complex MA2B2 is dsp2 hybridised then the shape of this complex is square planar.
Both isomers are optically inactive due to the presence of plane of symmetry. Optical isomers = 0