Chemistry - Coordination Chemistry Question with Solution | TestHub

A is Ma₃bcd: one fac form and three mer forms, distinguished by which pair among b,c,d is trans, giving four rather than three geometrical forms. Thus A is false. B follows from back-donation weakening C−O. The six Cl⁻ and net −2 charge require total Rh +4, so each equivalent Rh is +2, not +3: C is false. D is correct. Hence only B and D hold.