(i). Isomer ‘A’ reacts with AgNO3 and gives white precipitate, as the complex consists of Cl it reacts with the AgNO3 and gives the precipitate of AgCl and the reaction will be:
Hence isomer ‘A’ is
Similarly, in case of isomer ‘B’ it reacts with BaCl2 and gives white precipitate and it is obviously BaSO4 and the reaction will be:
Hence, the isomer ‘B’ will be
(ii)In this case, the counter ion (Cl-) in the complex salt is itself a potential ligand and displaces the ligand (SO4) which can then become the counter ion, therefore, it is a form of ionisation isomerism.
(iii) IUPAC name of isomer ‘A’-Pentaamminesulphatocobalt (III) chloride
And‘B’-Pentaamminechlorocobalt (III) sulphate.
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