Q59 / 180 · AIIMS 2016 · Chemistry

Assertion : $\mathrm{Co}\left[\mathrm{Hg}(\mathrm{SCN})_6\right]$ and $\mathrm{Hg}\left[\mathrm{Co}(\mathrm{SCN})_6\right]$ are isomers. Reason : $\mathrm{SCN}^{-}$is a stronger ligand as compared to $\mathrm{NCS}^{-}$.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • Correct answer
    C
    If assertion is true but reason is false.
  • D
    If both assertion and reason are false.

Solution

$\mathrm{Co}\left[\mathrm{Hg}(\mathrm{SCN})_6\right]$ and $\mathrm{Hg}\left[\mathrm{Co}(\mathrm{SCN})_6\right]$ are ionisation isomers. $\mathrm{NCS}^{-}$is stronger than $\mathrm{SCN}^{-}$.

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

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