In which of the following pairs, both the complexes have the same geometry but different hybridisation

{[N i C l_{4}]}_{4}^{2 -}, {[N i {(C N)}_{4}]}_{4}^{2 -}

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{[C o F_{6}]}_{6}^{3 -}, {[C o {(N H_{3})}_{6}]}_{6}^{3 +}

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[N i C l_{4}], {[N i {(C N)}_{4}]}_{4}^{2 -}

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{[C u {(N H_{3})}_{4}]}_{4}^{2 +}, {[N i {(N H_{3})}_{6}]}_{6}^{2 +}

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Solution

The correct option is B ${[C o F_{6}]}_{6}^{3 -}, {[C o {(N H_{3})}_{6}]}_{6}^{3 +}$
In $[C o F_{6}]^{3 -}, d^{6}$ configuration, high spin complex, 4 unpaired electron.
In this complex $s p^{3} d^{2}$ hybridization happens and octahedral geometry.
In $[C o (N H_{3})_{6}]^{+ 3}, d^{6}$ configuration, low spin complex, o unpaired electron.
In this $d^{2} s p^{3}$ hybridization happens and octahedral geometry.

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