# Which of the following complexes has a geometry different from others ?  Option 1) $[Ni Cl_4]^{2-}$ Option 2) $Ni(CO)_4$ Option 3) $[Ni (CN)_4]^{2-}$ Option 4) $[Zn(NH_3)_4]^{2+}$

S satyajeet

As we have learned

CFSE in tetrahedral complexes -

$CFSE = \left [-\frac{3}{5}\left ( No.\;of\;electron\;in\;e \right )+\frac{2}{5}\left ( No.\;of\;\acute{e}\;in\; t_{2}\right ) \right ] \bigtriangleup t$

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$[Ni(CN)_4]^2-$ has geometry square planar while other has tetrahedra

Option 1)

$[Ni Cl_4]^{2-}$

Option 2)

$Ni(CO)_4$

Option 3)

$[Ni (CN)_4]^{2-}$

Option 4)

$[Zn(NH_3)_4]^{2+}$

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