JEE MAIN - Chemistry (2024 - 6th April Morning Shift - No. 6)
Consider the following complexes
(A) $$\left[\mathrm{CoCl}\left(\mathrm{NH}_3\right)_5\right]^{2+}$$, (B) $$\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}$$, (C) $$ \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2 \mathrm{O}\right)\right]^{3+} $$, (D) $$\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+}$$
The correct order of A, B, C and D in terms of wavenumber of light absorbed is :
D < A < C < B
B < C < A < D
C < D < A < B
A < C < B < D
Explanation
Wavenumber $$=\frac{1}{\lambda} \propto$$ Frequency $$\propto \Delta_0$$
Wavenumber order : $$\mathrm{D}<\mathrm{A}<\mathrm{C}<\mathrm{B}$$
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