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Correct order of power ligand in spectro...

Correct order of power ligand in spectrochemical series

A

`I^(-) lt Br^(-) lt Cl^(-)`

B

`C_(2)O_(4)^(2-) lt H_(2)O lt NCS^(-)`

C

`NH_(3) lt CN^(-) lt CO `

D

All of these

Text Solution

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The correct Answer is:
To determine the correct order of power ligands in the spectrochemical series, we need to understand the concept of the spectrochemical series itself. The spectrochemical series arranges ligands based on their ability to split the d-orbitals of transition metal ions, which in turn affects the color and stability of coordination compounds. ### Step-by-Step Solution: 1. **Understand the Spectrochemical Series**: - The spectrochemical series is a list that ranks ligands based on their field strength, which influences the splitting of d-orbitals in transition metal complexes. Strong field ligands cause a larger splitting of d-orbitals compared to weak field ligands. 2. **List of Ligands**: - The common ligands in the spectrochemical series include: - Strong field ligands: CO, CN-, C6H5-, NO2-, biphenyl, ethylenediamine (en), NH3, pyridine. - Moderate field ligands: NCS-, H2O, oxalate (C2O4^2-), ethanol (EtOH). - Weak field ligands: OH-, F-, NO3-, Cl-, SCN-, S2-, Br-, I-. 3. **Rank the Ligands**: - Based on the strength of the ligands, the order from strongest to weakest is as follows: - CO > CN- > C6H5- > NO2- > biphenyl > en > NH3 > pyridine > NCS- > H2O > oxalate > EtOH > OH- > F- > NO3- > Cl- > SCN- > S2- > Br- > I-. 4. **Analyze the Options**: - Given the options in the question, we need to check if the provided orders of ligands match the established order in the spectrochemical series. - For example: - Option 1: Cl- > Br- > I- (correct as Cl- is stronger than Br- and I-). - Option 2: NCS- > H2O > C2O4^2- (correct as NCS- is stronger than H2O and C2O4^2-). - Option 3: NH3 > CN- > CO (incorrect order; CO is the strongest). - Option 4: All of these (incorrect since option 3 is wrong). 5. **Conclusion**: - The correct answer is that not all provided orders are correct, as option 3 does not follow the correct order in the spectrochemical series. ### Final Answer: The correct order of power ligands in the spectrochemical series is: - CO > CN- > C6H5- > NO2- > en > NH3 > NCS- > H2O > C2O4^2- > EtOH > OH- > F- > NO3- > Cl- > SCN- > S2- > Br- > I-.
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