Which of the following pairs of complexes are isomeric with each their but their aqueous solutions exhibit different molar conductivities ?

Options

A. `[PtCl_(2)(NH_(3))_(4)]Br_(2) and [Pt Br_(2)(NH_(3))_(4)]Cl_(2)`
B. `[CoCl_(2)(NH_(3))_(4)]NO_(2) and [CoCl(NO_(2))(NH_(3))_(4)]Cl`
C. `[Co(NO_(2))(NH_(3))_(5)]Cl_(2) and [Co(ONO)(NH_(3))_(5)]Cl_(2)`
D. `[CoBr(NH_(3))_(5)]SO_(4) and [Co(SO)_(4))(NH_(3))_(5)]Br`

Answer

D

Explanation

`[CoBr(NH_(3))_(5)]SO_(4) hArr [CoBr(NH_(3))_(5)]^(2+)+SO_(4)^(2-), " Total charges"=4`
`[Co(SO_(4))(NH_(3))_(5)Br hArr [Co(SO_(4))(NH_(3))_(5)]^(+)+Br^(-)," total charges"=2`
Hence, both have different molar conductivities.