JEE Advanced | 2018Coordination CompoundHard

Question

The correct option(s) regarding the complex [Co(en) (NH3)3(H2O)]3+ :-

(en = H2NCH2CH2NH2) is /are

Options

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+

Solution

(A) [Co(en)(NH3)3(H2O)]+3 complex is type of [M(AA)b3c] have two G.I.


(B) If (en) is replaced by two cynide ligand, complex will be type of [Ma3b2c] and have 3 G.I

(C) [Co(en)(NH3)3(H2O)]3+ have d6 configuration (t2g6) on central metal with SFL therefore it is dimagnetic in nature.
(D) Complex [Co(en)(NH3)3(H2O)]3+ have lesser CFSE (∆o) value than [Co(en)(NH3)4]3+ therefore complex [Co(en)(NH3)3(H2O)]+ absorbs longer wavelength for d–d transition.


 

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