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Question: Answered & Verified by Expert
Pick out the complex compound in which the central metal atom obeys $\mathrm{EAN}$ rule strictly.
ChemistryCoordination CompoundsCOMEDKCOMEDK 2013
Options:
  • A $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$
  • B $\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$
  • C $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3}$
  • D $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{SO}_{4}$
Solution:
2103 Upvotes Verified Answer
The correct answer is: $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$
In $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$, the central metal atom obeys EAN rule.
EAN $=Z-X+Y=26-2+12=36$
where,
$Z$ = atomic number
$X=$ number of electrons lost, while forming metal ion.
$Y=$ number of electron donated by ligands.

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