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?

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