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 $D$.

Column-$1$ (Reaction)	Column-$2$ (Main product)
$A$. $4FeCl_3 + 3K_4[Fe(CN)_6] \rightarrow$	$I$. $Fe_4[Fe(CN)_6]_3$
$B$. $ZnCl_2 + 4NaOH \rightarrow$	$V$. $Na_2ZnO_2$
$C$. $2FeCl_3 + H_2S \rightarrow$	$II$. $FeCl_2$

List-$I$	List-$II$
$I$. $[Cr(CN)_6]^{4-}$	$P$. $t_{2g}$ orbitals contain $4$ electrons
$II$. $[RuCl_6]^{2-}$	$Q$. $\mu$ (spin-only) $= 4.9 \ BM$
$III$. $[Cr(H_2O)_6]^{2+}$	$R$. low spin complex ion
$IV$. $[Fe(H_2O)_6]^{2+}$	$S$. metal ion in $4+$ oxidation state
	$T$. $d^4$ species

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

Similar Questions

Match the following:
Column-$1$ (Reaction) Column-$2$ (Main product)
$A$. $4FeCl_3 + 3K_4[Fe(CN)_6] \rightarrow$ $I$. $Fe_4[Fe(CN)_6]_3$
$B$. $ZnCl_2 + 4NaOH \rightarrow$ $V$. $Na_2ZnO_2$
$C$. $2FeCl_3 + H_2S \rightarrow$ $II$. $FeCl_2$

Total number of molecules/species from the following which will be paramagnetic is $........$
$O_2, O_2^{+}, O_2^{-}, NO, NO_2, CO, K_2[NiCl_4], [Co(NH_3)_6]Cl_3, K_2[Ni(CN)_4]$

Which of the following statements is correct?

The given complex $M(ABCDEF)$ exhibits which of the following isomerism?

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