CoSO_(4)Cl.5NH_(3) exists in two isomeric forms 'A' and 'B'. Isomer 'A' reacts with AgNO_(3) to give white precipitate, but does not react with BaCl_(2). Isomer 'B' gives white precipitate with BaCl_(2) but does not react with AgNO_(3). Answer the following questions. Identify 'A' and 'B' and write their structural formulas. (ii) Name the type of isomerism involved. (iii) Give the IUPAC name of 'A' and 'B'.

CoSO_(4)Cl.5NH_(3) exists in two isomeric forms 'A' and 'B'. Isomer 'A

1.	CoSO_(4)Cl.5NH_(3) exists in two isomeric forms 'A' and 'B'. Isomer 'A' reacts with AgNO_(3) to give white precipitate, but does not react with BaCl_(2). Isomer 'B' gives white precipitate with BaCl_(2) but does not react with AgNO_(3). Answer the following questions. Identify 'A' and 'B' and write their structural formulas. (ii) Name the type of isomerism involved. (iii) Give the IUPAC name of 'A' and 'B'.
Answer» Solution :(i) As ISOMER A reacts with `AgNO_(3)` to give a white PRECIPITATE, Cl must be present in the ionization SPHERE. As it does not react with `BaCl_(2)`, `SO_(4)^(2-)` must be present in coordination sphere. `therefore` Formula of `A=[Co(NH_(3))_(5)SO_(4)]Cl` (coordination no. of Co=6) As reactions are reverse for isomer B, formula `B=[Co(NH_(3))_(5)Cl]SO_(4)` (ii) Ionisation isomerism (iii) A = Pentaamminesulphatocobalt (III) chloride , B = Pentaamminechloridocobalt (III) SULPHATE.