Which of the following complex ions is not ex | vedclass

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(B) complex ion absorbs visible light if it contains unpaired electrons,which allow for $d-d$ transitions.$1$. $[Ni(H_2O)_6]^{2+}$: $Ni^{2+}$ is $3d^8

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

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(B) complex ion absorbs visible light if it contains unpaired electrons,which allow for $d-d$ transitions.$1$. $[Ni(H_2O)_6]^{2+}$: $Ni^{2+}$ is $3d^8$,which has $2$ unpaired electrons.$2$. $[Ni(CN)_4]^{2-}$: $Ni^{2+}$ is $3d^8$. $CN^-$ is a strong field ligand,causing pairing of electrons to form a $dsp^2$ square planar complex with $0$ unpaired electrons.$3$. $[Cr(NH_3)_6]^{3+}$: $Cr^{3+}$ is $3d^3$,which has $3$ unpaired electrons.$4$. $[Fe(H_2O)_6]^{2+}$: $Fe^{2+}$ is $3d^6$,which has $4$ unpaired electrons.Since $[Ni(CN)_4]^{2-}$ has no unpaired electrons,it does not undergo $d-d$ transitions and is not expected to absorb visible light.

Which of the following complex ions is not expected to absorb visible light?

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