Which of the following complexes is an outer orbital complex?
A
[Co(NH3)6]3+
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B
[Mn(CN)6]4−
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C
[Fe(CN)6]4−
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D
[Ni(NH3)6]2+
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Solution
The correct option is D[Ni(NH3)6]2+ Outer orbital complexes are the complexes that use outer d-orbitals in hybridisation. The hybridisation of the given complexes are as follows:
A) [Co(NH3)6]3+=d2sp3 B) [Mn(CN)6]4−=d2sp3 C) [Fe(CN)6]4−=d2sp3 D) [Ni(NH3)6]2+=sp3d2
So, only [Ni(NH3)6]2+ is an outer orbital complex.