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  • {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} .

\text {CoSO}_{4}\text {Cl}.\text {5NH}_{3} exists in two isomeric forms ‘A’ and ‘B’. Isomer ‘A’ reacts with \text {AgNO}_{3}  to give white precipitate, but does not react with \text {BaCl}_{2} . Isomer ‘B’ gives white precipitate with \text {BaCl}_{2} but does not react with \text {AgNO}_{3}. Answer the following questions.

(i) 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’.

Answers (1)

\text {CoSO}_{4}\text {Cl}.\text {5NH}_{3} :

(i). The first isomer A reacts with \text {AgNO}_{3} and not with \text {BaCl}_{2}, that means it has a \text {Cl}^{-} ion outside the coordination sphere. Therefore, A is \left [ Co\left ( NH_{3} \right )_{5}SO_{4} \right ]Cl

B reacts with \text {BaCl}_{2} and does not react with \text {AgNO}_{3}, that means it has SO^{-}_{4} outside the coordination sphere. Therefore B is \left [ Co\left ( NH_{3} \right )_{5}Cl\right ]SO_{4}

(ii). Ionisation Isomerism

(iii). A is Pentaamminesulphatocobalt (III) chloride while B is Pentaamminechlorocobalt (III) sulphate.

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