Q18 / 180 · KCET 2024 · Chemistry

The complex compounds $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{SO}_4\right] \mathrm{Br}$ and $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Br}\right] \mathrm{SO}_4$ are

  • A
    coordination isomers
  • B
    geometrical isomers
  • C
    optical isomers
  • Correct answer
    D
    ionisation isomers

Solution

The complex $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{SO}_4\right] \mathrm{Br}$ and $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Br}\right] \mathrm{SO}_4$ are ionisation isomers of each other. - This form of isomerism arises when the counter ion in a complex salt is itself a potential ligands and can displace a ligand which can then become the counter ion.

Hence, the correct answer is option: 'D'.

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