Which of the following does not obey the EAN | vedclass

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Question

(A) The $EAN$ (Effective Atomic Number) rule states that the total number of electrons around the central metal atom in a complex should be equal to t

Vedclass · Accepted Answer

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

Vedclass · Answer

(A) The $EAN$ (Effective Atomic Number) rule states that the total number of electrons around the central metal atom in a complex should be equal to the atomic number of the next noble gas.$1$. For $[Cu(NH_3)_4]^{2+}$: Atomic number of $Cu = 29$. Oxidation state $= +2$. Electrons in $Cu^{2+} = 27$. Electrons from $4 \ NH_3$ ligands $= 4 	imes 2 = 8$. $EAN = 27 + 8 = 35$. This does not equal $36$ (Krypton).$2$. For $[Zn(OH)_4]^{2-}$: Atomic number of $Zn = 30$. Oxidation state $= +2$. Electrons in $Zn^{2+} = 28$. Electrons from $4 \ OH^-$ ligands $= 4 	imes 2 = 8$. $EAN = 28 + 8 = 36$.$3$. For $[HgI_4]^{2-}$: Atomic number of $Hg = 80$. Oxidation state $= +2$. Electrons in $Hg^{2+} = 78$. Electrons from $4 \ I^-$ ligands $= 4 	imes 2 = 8$. $EAN = 78 + 8 = 86$ (Radon).$4$. For $[Fe(CO)_5]$: Atomic number of $Fe = 26$. Oxidation state $= 0$. Electrons in $Fe = 26$. Electrons from $5 \ CO$ ligands $= 5 	imes 2 = 10$. $EAN = 26 + 10 = 36$ (Krypton).Thus,$[Cu(NH_3)_4]^{2+}$ does not obey the $EAN$ rule.

Which of the following does not obey the $EAN$ rule?

Similar Questions

Choose the correct option regarding the following complex compounds which follow $(F)$ and do not follow $(NF)$ the Sidgwick $EAN$ rule:
$I. [(Ph_3P)_2PdCl_2PdCl_2]$
$II. [NiBrCl(en)]$
$III. Na_4[Fe(CN)_5NOS]$
$IV. Cr(CO)_3(NO)_2$
$I-II-III-IV$

The $EAN$ of $Fe$ in $K_4[Fe(CN)_6]$ is

The $EAN$ of platinum in potassium hexachloroplatinate $(IV)$ is :

Which of the following complexes does the central metal ion $NOT$ obey the $EAN$ rule? (Atomic numbers: $Pt=78, Cu=29, Zn=30, Fe=26$)

The complex that violates the Sidgwick's rule of $EAN$ is

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