Question

The correct option(s) regarding the complex [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⁺

Answer 1

Solution: A, B, D

Two geometrical isomers of [Co(en)(NH₃)₃H₂O]³⁺
(B)
[Co(NH₃)₃(CN)₂(H₂O)]⁺ => 3 geometrical isomers​

(C)
Since (en) and NH3 are strong field ligand, so it should be diamagnetic complex
(D)
(NH₃) is a stronger ligand than
H₂O, so, [Co(en) (NH₃)4]³⁺ should absorb shorter wavelength than [Co(en)(NH₃)₃(H₂O)]³⁺.