Which of the following complexes is an outer orbital complex?

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$[Co {({NH}_{3})}_{6}]^{3 +}$

$[Mn {(CN)}_{6}]^{4 -}$

$[Fe {(CN)}_{6}]^{4 -}$

$[Ni {({NH}_{3})}_{6}]^{2 +}$

answer is B.

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Detailed Solution

Generally, complex having strong filed ligand will act as inner orbital complex. CN⁻ is a strong field ligand NH₃act as strong field ligand in NH₃[Co(NH₃)₆]³⁺ and as weak field ligand in NI(NH₃)₆]⁺²

Complex ion	Hybridization of central atom
[Fe(CN)₆]⁴⁻	d²sp³ (inner)
[Mn(CN)₆]⁴⁻	d²sp³ (inner)
[Co(NH₃)₆]³⁺	d²sp³ (inner)
[Ni(NH₃)₆]²⁺	sp³d² (outer)

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