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Assertion : Co[Hg(SCN)(6)] and Hg[Co(SCN...

Assertion : `Co[Hg(SCN)_(6)] and Hg[Co(SCN)_(6)]` are isomers.
Reason : `SCN^(−)` is a stronger ligand as compared to `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.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze the assertion and reason provided: **Assertion:** `Co[Hg(SCN)_(6)]` and `Hg[Co(SCN)_(6)]` are isomers. **Reason:** `SCN^(−)` is a stronger ligand as compared to `NCS^(−)`. ### Step-by-Step Solution: 1. **Understanding Isomerism:** - Isomerism in coordination compounds can occur in various forms, including structural isomerism and stereoisomerism. In this case, we are looking at structural isomerism, specifically ionization isomerism. 2. **Identifying the Complexes:** - The complexes `Co[Hg(SCN)_(6)]` and `Hg[Co(SCN)_(6)]` have the same molecular formula but different structural arrangements. - `Co[Hg(SCN)_(6)]` indicates that cobalt is the central metal ion with a mercury complex, while `Hg[Co(SCN)_(6)]` indicates that mercury is the central metal ion with a cobalt complex. 3. **Determining Ionization Isomerism:** - Ionization isomers differ in the way ions are arranged in the complex. In this case, both complexes can dissociate to give different ions in solution, which confirms that they are indeed ionization isomers. 4. **Conclusion on Assertion:** - Since both complexes are structurally different and can yield different ions in solution, the assertion that `Co[Hg(SCN)_(6)]` and `Hg[Co(SCN)_(6)]` are isomers is **true**. 5. **Analyzing the Reason:** - The reason states that `SCN^(−)` is a stronger ligand compared to `NCS^(−)`. However, this statement is incorrect. - In coordination chemistry, `NCS^(−)` (isothiocyanate) is generally considered a stronger ligand than `SCN^(−)` (thiocyanate) because `NCS^(−)` binds through nitrogen, which is a better electron donor compared to sulfur in `SCN^(−)`. 6. **Conclusion on Reason:** - Therefore, the reason provided is **false**. ### Final Answer: - The assertion is true, but the reason is false.
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