Question:
Which of following coordinate complexes is an exception to $EAN$ rule ?
(Given At. No. Pt = 78, Fe = 26, Zn = 30, Cu = 29)
Which of following coordinate complexes is an exception to $EAN$ rule ?
(Given At. No. Pt = 78, Fe = 26, Zn = 30, Cu = 29)
Updated On: May 15, 2024
- $[Pt (NH_3)_6]^{4+}$
- $[Fe (CN_3)_6]^{4-}$
- $[Zn (NH_3)_4]^{2+}$
- $[Cu (NH_3)_4]^{2+}$
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The Correct Option is D
Solution and Explanation
$\left[ Cu \left( NH _{3}\right)_{4}\right]^{2+}$ is an exception to EAN rule.
$EAN = Z - X + Y$
$EAN =29-2+8=35$
The atomic number of nearest noble gas $( Kr )$ is $36$ .
Note:
${\left[ Pt \left( NH _{3}\right)_{6}\right]^{4+}}$
$EAN =78-4+12=86$
The atomic number of nearest noble gas $( Rn ) $ is $86$ .
$\left[ Fe ( CN )_{6}\right]^{4-}$
$EAN =26-2+12=36$
The atomic number of nearest noble gas $( Kr )$ is $36$ .
$\left[ Zn \left( NH _{3}\right)_{4}\right]^{2+}$
$EAN =30-2+8=36$
The atomic number of nearest noble gas $( Kr )$ is $36 .$
$EAN = Z - X + Y$
$EAN =29-2+8=35$
The atomic number of nearest noble gas $( Kr )$ is $36$ .
Note:
${\left[ Pt \left( NH _{3}\right)_{6}\right]^{4+}}$
$EAN =78-4+12=86$
The atomic number of nearest noble gas $( Rn ) $ is $86$ .
$\left[ Fe ( CN )_{6}\right]^{4-}$
$EAN =26-2+12=36$
The atomic number of nearest noble gas $( Kr )$ is $36$ .
$\left[ Zn \left( NH _{3}\right)_{4}\right]^{2+}$
$EAN =30-2+8=36$
The atomic number of nearest noble gas $( Kr )$ is $36 .$
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Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.