The correct option(s) regarding the complex ${\left[Co\left(en\right){\left(N{H}_{3}\right)}_{3}\left({H}_{2}O\right)\right]}^{3 +}$ :-
(en $= {H}_{2}NC{H}_{2}C{H}_{2}N{H}_{2}$ ) is (are)

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The correct option(s) regarding the complex [Co(en) (N H _ 3 ) _ 3 ( H _ 2 O)] ^ 3 + :- (en = H _ 2 NC H _ 2 C H _ 2 N H _ 2 ) is (are)

Quantrex Academy · Accepted Answer

Correct answer: A. It has two geometrical isomers

( i ) [Co(en) (N H _ 3 ) _ 3 ( H _ 2 O)] ^ + 3 complex is type of [ M(AA) b _ 3 c ] have two G.I. ( B ) If (en) is replaced by two cyanide ligand, complex will be type of [ M a _ 3 b _ 2 c ] and have 3 G.I. ( iii ) [Co(en) (N H _ 3 ) _ 3 ( H _ 2 O)] ^ 3 + have d ^ 6 configuration ( t _ 62g ^ 6 ) on central metal with SFL therefore it is dimagnetic in nature. ( iv ) Complex [Co(en) (N H _ 3 ) _ 3 ( H _ 2 O)] ^ 3 + have lesser CFSE ( ∆ _ O ) value than [ Co (en) (N H _ 3 ) _ 4 ] ^ 3 + therefore complex [Co(en) (N H _ 3 ) _ 3 ( H _ 2 O)] ^ + absorbs longer wavelength for d-d transition

The correct option(s) regarding the complex [Co(en) (N H _ 3 ) _ 3...

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