In which of the following complexes is the pa | vedclass

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(D) To determine if $(n-1)d$ electron pairing occurs,we look at the electronic configuration of the central metal ion in the presence of strong field

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All of these

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(D) To determine if $(n-1)d$ electron pairing occurs,we look at the electronic configuration of the central metal ion in the presence of strong field ligands $(SFL)$.$1$. For $[Ni(NH_3)_6]^{+2}$: $Ni^{+2}$ is $3d^8$. In an octahedral field,the configuration is $t_{2g}^6 e_g^2$. Since the $e_g$ orbitals are occupied,pairing is not possible in the $d$-orbitals.$2$. For $[Cr(CN)_6]^{-3}$: $Cr^{+3}$ is $3d^3$. The configuration is $t_{2g}^3 e_g^0$. There are no electrons in the $e_g$ orbitals to pair,and the $t_{2g}$ orbitals are singly occupied.$3$. For $[Cr(NH_3)_6]^{+3}$: $Cr^{+3}$ is $3d^3$. Similar to the above,the configuration is $t_{2g}^3 e_g^0$,where no pairing of $(n-1)d$ electrons occurs.Since all these complexes do not involve the pairing of $(n-1)d$ electrons due to their specific $d$-electron configurations,the correct answer is $D$.

In which of the following complexes is the pairing of $(n-1)d$ electrons $NOT$ present in the presence of strong field ligands $(SFL)$?

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