Given below are four statements regarding coordination compounds: (I) The complex [ Co ( NH ₃)₄ Cl ₂]^+ exhibits both geometrical and optical isomerism. (II) Facial (fac) and meridional (mer) isomers are shown by octahedral complexes of type MA ₃ B ₃ . (III) The complex [ Pt ( en )₂]²⁺ is optically active. (IV) Linkage isomerism arises in coordination compounds containing ambidentate ligands. How many of the above st

Step-by-step solution

Statement (I) is incorrect: The complex [ Co ( NH ₃)₄ Cl ₂]^+ is an octahedral complex of type MA ₄ B ₂ . It exhibits geometrical isomerism (cis and trans forms), but both forms possess a plane of symmetry and are optically inactive. Statement (II) is correct: Octahedral complexes of the type MA ₃ B ₃ (e.g., [ Co ( NH ₃)₃( NO ₂)₃] ) exhibit facial (fac) and meridional (mer) geometrical isomerism. Statement (III) is incorrect: Platinum(II) forms square planar complexes. The complex [ Pt ( en )₂]²⁺ has a square plana