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Question

Choose the correct option regarding the following complex compound which follows (F) and does not follow (NF) the Sidgwick EAN rule:
(I) [(Ph3P)3PdCl2PdCl2] (II) [NiBrCl(en)] (III) Na4[Fe(CN)5NOS] (IV) Cr(CO)3(NO)2.

A
(I) NF (II) NF (III) NF (IV) NF
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B
(I) F (II) F (III) NF (IV) F
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C
(I) NF (II) NF (III) F (IV) F
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D
(I) NF (II) NF (III) F (IV) NF
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Solution

The correct option is C (I) NF (II) NF (III) F (IV) F
EAN=ZX+Y
Z=Atomic number of the metal
X=Number of electrons lost during the formation of the metal ion from its atom
Y=Number of electrons donated by the ligands

(i) For [Ph3P)2PdCl2] AN of Pd=462+4×2=52.
The atomic number of xnon is 54.
Hence, it does not follows EAN.

(ii) For [NiBrCl(en)], EAN of Ni=282+8=34.
The atomic number of krypton is 36.
Hence, it does not follows EAN.

(iii) For Na4[Fe(CN)5NOS], EAN of Fe=262+5×2+2=36.
This is equal to the atomic number of krypton.
Hence, it follows EAN.

(iv) For Cr(CO)3(NO)2, EAN of Cr=240+3×2+3×2=36[Kr].
This is equal to the atomic number of krypton.
Hence, it follows EAN.

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