First slide

Structural isomerism

Question

Which would exhibit ionisation isomerism?

Moderate

A

$[Cr {({NH}_{3})}_{6}] {Cl}_{3}$
B

$[Co {({NH}_{3})}_{5} Br] {SO}_{4}$
C

$[Cr {(en)}_{2} {Cl}_{2}]$
D

$[Cr {(en)}_{3} {Cl}_{3}]$

Solution

The compound which has same composition but give different ions in solution, show ionization isomerism. So $[Co {({NH}_{3})}_{5} Br] {SO}_{4}$ is ionization isomer.
$\begin{array}{l} [Co {({NH}_{3})}_{5} Br] {SO}_{4} ⇌ {[Co {({NH}_{3})}_{5} Br]}^{2 +} + {SO}_{4}^{2 -} \\ [Co {({NH}_{3})}_{5} {SO}_{4}] Br ⇌ {[CO ({NH}_{3}) {SO}_{4}]}^{+} + {Br}^{-} \end{array}$

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