COMEDK · Chemistry · 24. Coordination Compounds

A transition metal M forms 4 homoleptic octahedral coordination compounds, A, B, C and D of the type [MX6] \({ }^{z-}\) with monodentate ligands \(\mathrm{a}, \mathrm{b}, \mathrm{c}\) and d respectively. These compounds absorb red, blue, yellow and blue-green light respectively. Which one of the options shows the correct order of decreasing ligand strength?

A \(\mathrm{A}>\mathrm{B}>\mathrm{C}>\mathrm{D}\)
B \(\mathrm{D}>\mathrm{C}>\mathrm{B}>\mathrm{A}\)
C \(\mathrm{A}>\mathrm{C}>\mathrm{D}>\mathrm{B}\)
D \(\mathrm{B}>\mathrm{D}>\mathrm{C}>\mathrm{A}\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(\mathrm{B}>\mathrm{D}>\mathrm{C}>\mathrm{A}\)

Step-by-step Solution

Detailed explanation

The energy of the absorbed light is inversely proportional to the wavelength of the light absorbed, given by \(E = \dfrac{hc}{\lambda}\). The crystal field splitting energy \(\Delta_o\) is directly proportional to the energy of the absorbed light. Therefore,…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Explore more questions on app

From COMEDK

Explore more questions on app