Assertion : Co[Hg(SCN)_6] and Hg[Co(SCN)_6] are isomers. Reason : SCN^ - is a stronger ligand as compared to NCS^ - .

Correct answer: C. If assertion is true but reason is false. Co[Hg(SCN)_6] and Hg[Co(SCN)_6] are ionisation isomers. NCS^ - is stronger than SCN^ - .

AIIMS 2016

AIIMS 2016 · Chemistry · Coordination Compounds

Assertion : Co[Hg(SCN)_6] and Hg[Co(SCN)_6] are isomers. Reason :...

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}^{-}

AIf both assertion and reason are true and reason is the correct explanation of assertion.
BIf both assertion and reason are true but reason is not the correct explanation of assertion.
CIf assertion is true but reason is false.
DIf both assertion and reason are false.

C. If assertion is true but reason is false.

\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}^{-}