Two complexes with empirical formula `Co(NH_(3))_(3)(H_(2)O)_(2) Br_(2)CI` exists in two isomeric forms `(A)` and `(B)`. Form A gives two moles of AgBr on treatment with `AgNO_(3)` solution whereas form `B` gives only one mole of AgBr. Give the structural formula of both these isomers. What are these isomer called?

Explanation

For empirical formual `Co(NH_(3))_(2)(H_(2)O)_(2)CI_(2)Br_(2)` one form gives two moles of AgBr on treatmnet with `AgNO_(3)` this idicates that `2Br^(Θ)` ions are present as counter ions and this from is `[Co(NH_(3))_(2)(H_(2)O)_(2)CI_(2)]Br_(2)rarr`
`[Co(NH_(3))_(2)(H_(2)O)_(2)CI_(2))]^(2+) + Br^(Θ)`
`2Br^(Θ) + 2AgNO_(3)rarr 2AgBrdarr+2NO_(2)^(Θ)`
The other form gives one mloe of AgBr this indicates that one `Br^(Θ)` ion is present as counter ion and this form is `[Co(NH_(3))_(2)(H_(2)O))CI_(2)Br]Br.H_(2)O`
`(:" Coordination number of" Co^(3+)` is 6, so one `H_(2)O` is present as hydrate moleculte )
`[Co(NH_(3))_(2)(H_(2)O)CI_(2)Br]Br.H_(2)O`
`rarr[Co(NH_(3))_(2)(H(2)O)CI_(2)Br]^(o+) + Br^(Θ) + H_(2)O`
`AgNO_(3)+ Br^(Θ) rarr AgBrdarr+No_(3)^(Θ)` .