Single Choice

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

A$$K_4[Fe(CN)_6] $$
Correct Answer
B$$ K_3[Fe(CN)_6] $$
C$$ [Cr(H_2O)_6]Cl_3$$
D$$[Cu(NH_3)_4]SO_4$$

Solution

In a metal complex, the metal atom tends to surround itself with sufficient ligands that the resulting effective atomic number is numerically equal to the atomic number of the noble gas element found in the same period in which the metal is present.

In $$\displaystyle K_4[Fe(CN)_6]$$, he central metal atom obeys EAN rule strictly.

$$\displaystyle EAN = Z-X+2Y = 26 - 2 + 12 = 36$$

$$\displaystyle Z=$$ atomic number of metal
$$\displaystyle X=$$ number of electrons lost while forming metal ion
$$\displaystyle Y=$$ number of electrons donated by ligands

The $$EAN$$ is equal to the atomic number of the nearest noble gas $$Kr$$.

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

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) $$Cr(CO)_{3}(NO)_{2}$$.

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

In $$[Ni{ \left( { NH }_{ 3 } \right) }_{ 4 }]{ SO }_{ 4 }$$, the E.A.N. of Ni is

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