Question

Which would exhibit ionisation isomerism?

• A. $[Cr(NH_{3})_{6}]Cl_{3}$
• B. $[Co(NH_{3})_{5}Br]SO_{4}$
• C. $[Cr(en)_{2}Cl_{2}]$
• D. $[Cr(en)_{3}Cl_{3}]$

Answer 1

Answer: (B)

The compound which has same composition but give different ions in solution show ionization. So $[Co(NH_{3})_{5}Br]SO_{4}$ is ionization isomer.
$[Co(NH_{3})_{5} Br]SO_{4} \rightleftharpoons [Co(NH_{3})_{5}Br]^{2+} + SO^{2-}_{4}$
$[Co(NH_{3})_{5} SO_{4}] Br \rightleftharpoons [Co(NH_{3}) SO_{4}]^{+} + Br^{-}$