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The order of strength of ligand is en > NH3 > H2O. For strong ligand, the value of Δ0 for the complex is higher. Hence, the increasing order of wavelengths of absorption is:

1. [Co(en)3]3+ < [Co(NH3)6]3+ < [Co(H2O)6]3+
2. [Co(NH3)6]3+ < [Co(en)3]3+ < [Co(H2O)6]3+
3. [Co(H2O)6]3+ < [Co(NH3)6]3+ < [Co(en)3]3+
4. [Co(H2O)6]3+ < [Co(en)3]3+ < [Co(NH3)6]3+

Correct answer: [Co(en)3]3+ < [Co(NH3)6]3+ < [Co(H2O)6]3+

Solution

The ligand strength determines the crystal field splitting energy (Δ0). Stronger ligands like en cause higher Δ0, leading to absorption of light with shorter wavelengths. Thus, the order of absorption wavelengths is [Co(en)3]3+ < [Co(NH3)6]3+ < [Co(H2O)6]3+.

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