Solveeit Logo
Login

Question

Chemistry Question on coordination compounds

The correct sequence of ligands in the order of decreasing field strength is :

A

CO>H2O>F−>S2−\text{CO} > \text{H}_2\text{O} > \text{F}^- > \text{S}^{2-}

B

OH−>F−>NH3>CN−\text{OH}^- > \text{F}^- > \text{NH}_3 > \text{CN}^-

C

NCS−>EDTA4−>CN−>CO\text{NCS}^- > \text{EDTA}^{4-} > \text{CN}^- > \text{CO}

D

S2−>OH−>EDTA4−>CO\text{S}^{2-} > \text{OH}^- > \text{EDTA}^{4-} > \text{CO}

Answer

CO>H2O>F−>S2−\text{CO} > \text{H}_2\text{O} > \text{F}^- > \text{S}^{2-}

Explanation

Solution

Understanding Ligand Field Strength:

The strength of a ligand in the context of field strength refers to its ability to split the dd-orbitals of a transition metal ion, which affects the color, magnetic properties, and stability of the metal complex. Ligands are arranged according to their field strength in the Spectrochemical Series.

Spectrochemical Series:

According to the Spectrochemical Series, ligands are arranged in the following order of increasing field strength:

I−<Br−<S2−<Cl−<F−<OH−<H2O<NCS−<EDTA4−<NH3<en<CN−<COI^- < \text{Br}^- < S^{2-} < \text{Cl}^- < \text{F}^- < \text{OH}^- < \text{H}_2\text{O} < \text{NCS}^- < \text{EDTA}^{4-} < \text{NH}_3 < \text{en} < \text{CN}^- < \text{CO}

Arrange the Given Ligands in Decreasing Field Strength:

From the Spectrochemical Series:

CO>H2O>F−>S2−\text{CO} > \text{H}_2\text{O} > \text{F}^- > S^{2-}

Conclusion:

The correct sequence in the order of decreasing field strength is:

CO>H2O>F−>S2−\text{CO} > \text{H}_2\text{O} > \text{F}^- > S^{2-}

which corresponds to Option (1).