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Consider the following complexes. ) B ( ) A ( ] ) CN ( Co [ ] ) NH ( CoCl [ 3 6 2 5 3   ) D ( ) C ( ] ) O H ( Cu [ )] O H ( ) NH ( Co [ 2 4 2 3 2 5 3   The correct order of A, B, C and D in terms of wavenumber of light absorbed is :

1. C < D < A < B
2. D < A < C < B
3. A < C < B < D
4. B < C < A < D

Correct answer: D < A < C < B

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