First slide

Structural isomerism

Question

Which one of the following pair of complexes represent a pair of ionization isomers?

Easy

A

$[Cr {({NH}_{3})}_{6}] [Co {(CN)}_{6}] and [Co {({NH}_{3})}_{6}] [Cr {(CN)}_{6}]$
B

$[Co {({NH}_{3})}_{3} {Cl}_{3}] and [Cr {({NH}_{3})}_{4} {Cl}_{2}] Cl$
C

$[Co {({NH}_{3})}_{4} {Cl}_{2}] Br and [Co {({NH}_{3})}_{4} ClBr] Cl$
D

$[Pt {({NH}_{3})}_{2} {Cl}_{2}] and [Pt {({NH}_{3})}_{2} {Br}_{2}]$

Solution

$\begin{array}{l} [Co {({NH}_{3})}_{4} {Cl}_{2}] Br ⇌ {[Co {({NH}_{3})}_{4} {Cl}_{2}]}^{+} + {Br}^{-} \\ [Co {({NH}_{3})}_{4} ClBr] Cl ⇌ {[Co {({NH}_{3})}_{4} ClBr]}^{+} + {Cl}^{-} \end{array}$
These two isomers differ in the ions produced in aqueous solution.

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