Homoleptic octahedral complexes of a metal ion ' $\mathrm{M}^{3+1}$ with three monodentate ligands $\mathrm{L}_1, \mathrm{~L}_2$ and $\mathrm{L}_3$ absorb wavelengths in the region of green, blue and red respectively. The increasing order of the ligand strength is:
Select the correct option:
A
$\mathrm{L}_1<\mathrm{L}_2<\mathrm{L}_3$
B
$\mathrm{L}_3<\mathrm{L}_2<\mathrm{L}_1$
C
$\mathrm{L}_3<\mathrm{L}_1<\mathrm{L}_2$
D
$\mathrm{L}_2<\mathrm{L}_1<\mathrm{L}_3$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
Sol. Greater the energy or lesser the wavelength of light absorbed, greater is the ligand strength
\begin{tabular}{ccc}
Energy : Blue $>$ & Green $>$ & Red \\
$L_2$ & $L_1$ & $L_3$
\end{tabular}
So, ligand strength: $L_2>L_1>L_3$
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