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Question:

The correct option(s) regarding the complex [Co(en)(NH3)3(H2O)]3+ (en=H2NCH2CH2NH2) is/are: It is paramagnetic. It will have three geometrical isomers if bidentate 'en' is replaced by two cyanide ligands. It has two geometrical isomers. It absorbs light at a longer wavelength as compared to [Co(en)(NH3)4]3+.

It is paramagnetic.

It absorbs light at a longer wavelength as compared to [Co(en)(NH3)4]3+.

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

It has two geometrical isomers.

Solution:

(A) [Co(en)(NH3)3(H2O)]+3 complex is type of [M(AA)b3c] which will have two geometrical isomers (B) If (en) is replaced by two cyanide ligands, the complex will be type of [Ma3b2c] and have 3 geometrical isomers (C) [Co(en)(NH3)3(H2O)]3+ have d6 configuration (t2g6) on central metal with strong field ligands, therefore it is diamagnetic in nature (D) Complex [Co(en)(NH3)3(H2O)]3+ have lesser CFSE (Δo) value than [Co(en)(NH3)4]3+ therefore complex [Co(en)(NH3)3(H2O)]+ absorbs longer wavelength for d-d transition.