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Q.

Choose the correct option regarding the following complex compound which follows (F) and does not follow (NF) the Sidgwick EAN rule :

(I) [(Ph3P)2PdCl2PdCl2 ]                             (II) [NiBrCl(en)]
(III) Na4 [Fe(CN)5NO5]                                (IV) Cr(CO)3(NO)2

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a

(I) (II) (III) (IV)
FFNFF

b

(I) (II) (III) (IV)
NFNFNFNF

c

(I) (II) (III) (IV)
NFNFFF

d

(I) (II) (III) (IV)
NFNFFNF

answer is C.

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Detailed Solution

 (I) [(Ph3P)2PdClPdCl2]; EAN of Pd= 46 -2 + 4 x 2 = 52  (II) [NiBrCl(en)]; EAN of Ni =28 - 2 +8 =34  (III) Na4Fe(CN)5NOS]; EAN of Fe= 26 - 2 + 5 x 2 + 2 = 36 [Kr]  (IV) Cr(CO)3(NO)2;           EAN of Cr= 24 -0 + 3 x 2 + 3 x 2 = 36 [Kr]

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