Coordination Compounds 2 Question 19
21. Homoleptic octahedral complexes of a metal ion ’ $M^{3+}$ ’ with three monodentate ligands $L _1, L _2$ and $L _3$ absorb wavelengths in the region of green, blue and red respectively. The increasing order of the ligand strength is
(2019 Main, 9 Jan II)
(a) $L _1 < L _2 < L _3$
(c) $L _3 < L _1 < L _2$
(b) $L _2 < L _1 < L _3$
(d) $L _3 < L _2 < L _1$
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Answer:
Correct Answer: 21. (c)
Solution:
- In homoleptic complexes, the metal atom/ion is linked to only one type of ligand. Assuming, ligands are neutral, the octahedral complexes of $M^{3+}$ can be,
We know, ligand strength $\propto \Delta _{\text {absorption }}^{\circ}$
So, the increasing order of the ligand strength will be, $L _3 < L _1 < L _2$
BETA
