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AIIMS2019Chemistry-Coordination Compounds

AIIMS 2019 Chemistry Optical Isomerism MCQ Question

Type: MCQ-conceptual-Easy-Class 12

Correct increasing order for the wavelength of absorption in the visible region for the complexes of Co3+\text{Co}^{3+} is:

A

[Co(CN)6]3−,[Co(NH3)6]3+,[Co(NH3)5(H2O)]3+,[Co(NH3)5Cl]+2[\text{Co}(\text{CN})_6]^{3-} , [\text{Co}(\text{NH}_3)_6]^{3+} , [\text{Co}(\text{NH}_3)_5(\text{H}_2\text{O})]^{3+} , [\text{Co}(\text{NH}_3)_5\text{Cl}]^{+2}

B

[Co(CN)6]3−,[Co(NH3)5(H2O)]3+,[Co(NH3)5Cl]+2,[Co(NH3)6]3+[\text{Co}(\text{CN})_6]^{3-} , [\text{Co}(\text{NH}_3)_5(\text{H}_2\text{O})]^{3+} , [\text{Co}(\text{NH}_3)_5\text{Cl}]^{+2} , [\text{Co}(\text{NH}_3)_6]^{3+}

C

[Co(NH3)6]3+,[Co(CN)6]3−,[Co(NH3)5(H2O)]3+,[Co(NH3)5Cl]+2[\text{Co}(\text{NH}_3)_6]^{3+} , [\text{Co}(\text{CN})_6]^{3-} , [\text{Co}(\text{NH}_3)_5(\text{H}_2\text{O})]^{3+} , [\text{Co}(\text{NH}_3)_5\text{Cl}]^{+2}

D

[Co(NH3)5Cl]+2,[Co(NH3)5(H2O)]3+,[Co(NH3)6]3+,[Co(CN)6]3−[\text{Co}(\text{NH}_3)_5\text{Cl}]^{+2} , [\text{Co}(\text{NH}_3)_5(\text{H}_2\text{O})]^{3+} , [\text{Co}(\text{NH}_3)_6]^{3+} , [\text{Co}(\text{CN})_6]^{3-}

Correct Answer

Option A

Detailed Explanation

The coordination complex [RhCl(CO)(PPh₃)(NH₃)] is square planar, which typically results in a symmetrical arrangement of ligands around the central metal atom. This symmetry leads to the absence of optical isomerism, making the complex optically inactive. Other options are irrelevant as they do not apply to the question's context regarding the optical activity of the complex. Understanding the geometry and symmetry of coordination complexes is crucial in predicting their optical properties.

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