Question

The correct order of the wavelength of light absorbed by the following complexes is,

A. \([Co(NH_3)_6]^{3+}\)

B. \([Co(CN)_6]^{3-}\)

C. \([Cu(H_2O)_4]^{2+}\)

D. \([Ti(H_2O)_6]^{3+}\)

Choose the correct answer from the options given below: 

(1) \(B < D < A < C \)

(2) \(B < A < D < C \)

(3) \(C < D < A < B \)

(4) \(C < A < D < B\)

Answer 1

Correct option is:  (2) \(B < A < D < C \)

\(\lambda \propto \frac{1}{\text{strength of ligand}}\)

\(\lambda \propto \frac{1}{\text{splitting}}\)

A. \([Co(NH_3)_6]^{3+} \quad ; \quad 475 \ nm\)

B. \([Co(CN)_6]^{3-} \quad ; \quad 310 \ nm\)

C. \([Cu(H_2O)_4]^{2+} \quad ; \quad 600 \ nm\)

D. \([Ti(H_2O)_6]^{3+} \quad ; \quad 498 \ nm\)

Order of \(\lambda = C > D > A > B\)