Single Choice

Choose the correct option regarding the following complex compound which follows $$(F)$$ and does not follow $$(NF)$$ the Sidgwick EAN rule: (I) $$[(Ph_{3}P)_{3}PdCl_{2}PdCl_{2}]$$ (II) $$[NiBrCl(en)]$$ (III) $$Na_{4}[Fe(CN)_{5}NOS]$$ (IV) $$Cr(CO)_{3}(NO)_{2}$$.

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

Solution

$$EAN=Z-X+Y$$
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 $$[Ph_3P)_2PdCl_2]$$ AN of $$Pd=46-2+4\times 2=52$$.
The atomic number of xnon is 54.
Hence, it does not follows EAN.

(ii) For $$[NiBrCl(en)]$$, EAN of $$Ni=28-2+8=34$$.
The atomic number of krypton is 36.
Hence, it does not follows EAN.

(iii) For $$Na_4[Fe(CN)_5NOS]$$, EAN of $$Fe=26-2+5\times 2+2=36$$.
This is equal to the atomic number of krypton.
Hence, it follows EAN.

(iv) For $$Cr(CO)_3(NO)_2$$, EAN of $$Cr=24-0+3\times 2+3\times 2=36[Kr]$$.
This is equal to the atomic number of krypton.
Hence, it follows EAN.

SIMILAR QUESTIONS

Coordination Compounds

The effective atomic number of Cr(atomic number$$=24$$) in $$[Cr(NH_3)_6]Cl_3$$ is?

Coordination Compounds

What is` the EAN of $${ \left[ Al{ \left( { C }_{ 4 }{ O }_{ 4 } \right) }_{ 3 } \right] }^{ 3- }$$ ?

Coordination Compounds

Which of following coordinate complexes is an exception to EAN rule ? (Given Atomic Number: $$Pt = 78,\ Fe = 26,\ Zn = 30,\ Cu = 29$$)

Coordination Compounds

If EAN of central metal cation M2+ in a non-chelating complex is 36 and atomic no. of metal M is 26, then the number of monodentate ligand in this complex are

Coordination Compounds

Which of the following is an oxidizing agent?

Coordination Compounds

Which of the following pair to $$EAN$$ of central metal atom is not same?

Coordination Compounds

Which of the following compound has/have effective atomic number equal to the atomic number of a noble gas?

Coordination Compounds

$$M(CO)_{x} (NO)_{y} \underset {-CO}{\xrightarrow {+NO}}M(NO)_{z}$$ Where $$EAN$$ of metal $$(M)$$ in both product and reactant is same and it is $$54$$. Then calculate value of $$(x + y - z)$$. (where $$x, y$$ and $$z$$ are natural numbers and $$M$$ belong to $$6^{th}$$ group according to long form of periodic table).

Coordination Compounds

Pick out the complex compound in which the central metal atom obeys EAN rule strictly :

Coordination Compounds

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