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Chemistry Question on coordination compounds

The correct option(s) regarding the complex [Co(en)(NH3)3(H2O)]3+(en=H2NCH2CH2NH2){[Co(en)(NH3)3(H2O)]^{3+} (en = H2NCH2CH2NH2)} is (are)

A

It has two geometrical isomers

B

It will have three geometrical isomers if bidentate ?en? is replaced by two cyanide ligands

C

It is paramagnetic

D

It absorbs light at longer wavelength as compared to [Co(en)(NH3)4]3+{[Co(en)(NH3)4]^{3+}}

Answer

It absorbs light at longer wavelength as compared to [Co(en)(NH3)4]3+{[Co(en)(NH3)4]^{3+}}

Explanation

Solution

(A) [Co(en)(NH3)3(H2O)]+3{[Co(en)(NH_3)_3 (H_2O)]^{+3}} complex is type of [M(AA)b3c]{[M(AA)b_3 c ]} have two G.I.
(B) If (en) is replaced by two cynide ligand, complex will be type of [Ma3b2c]{ [Ma3b2c]} and have 3 G.I.
(C) [Co(en)(NH3)3(H2O)]3+{[Co(en)(NH3)3(H2O)]^{3+}} have d6 configuration (t2g6){(t^6_{2g})} on central metal with SFL therefore it is dimagnetic
in nature.
(D) Complex [Co(en)(NH3)3(H2O)]3+{ [Co(en)(NH3)3(H2O)]^{3+}} have lesser CFSE(ΔO){CFSE (\Delta_O)} value than [Co(en)(NH3)4]3+{[Co(en)(NH3)4]^{3+}} therefore complex [Co(en)(NH3)3(H2O)]+{ [Co(en)(NH3)3(H2O)]^{+}} absorbs longer wavelength for d-d transition.