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Chemistry Question on coordination compounds

Correct increasing order for the wavelengths of absorption in the visible region the complexes of Co3+Co^{3+} is :

A

[Co(H2O)6]3+, [Co(en)3]3+, [Co(NH3)6]3+[Co(H_2O)_6]^{3+},\, [Co(en)_3]^{3+},\, [Co(NH_3)_6]^{3+}

B

[Co(H2O)6]3+, [Co(NH3)6]3+, [Co(en)3]3+[Co(H_2O)_6]^{3+},\, [Co(NH_3)_6]^{3+},\, [Co(en)_3]^{3+}

C

[Co(NH3)6]3+, [Co(en)3]3+, [Co(H2O)6]3+[Co(NH_3)_6]^{3+},\, [Co(en)_3]^{3+} ,\, [Co(H_2O)_6]^{3+}

D

[Co(en)3]3+, [Co(NH3)6]3+, [Co(H2O)6]3+[Co(en)_3]^{3+} ,\, [Co(NH_3)_6]^{3+},\, [Co(H_2O)_6]^{3+}

Answer

[Co(en)3]3+, [Co(NH3)6]3+, [Co(H2O)6]3+[Co(en)_3]^{3+} ,\, [Co(NH_3)_6]^{3+},\, [Co(H_2O)_6]^{3+}

Explanation

Solution

The order of the ligand in the spectrochemical series

H2O<NH3<enH _{2} O < NH _{3}< en

Hence, the wavelength of the light observed will be in the order
[Co(en)3]3+,[Co(NH3)6]3+,[Co(H2O)6]3+