Which from following complexes, the central metal ion does NOT obey EAN rule? (Atomic number -…

Which from following complexes, the central metal ion does NOT obey EAN rule? (Atomic number - $\mathrm{Pt}=78, \mathrm{Cu}=29, \mathrm{Zn}=30, \mathrm{Fe}=26$ )
  1. $\left[7 n\left(N H_{3}\right)_{4}\right]^{2+}$
  2. $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}$
  3. $\left[\mathrm{P} \mathrm{t}\left(\mathrm{NH}_{3}\right)_{6}\right]^{4+}$
  4. $\left[\mathrm{Fe}(\mathrm{G})_{6}\right]^{4-}$

Solution

$\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \rightarrow \mathrm{EAN}=\mathrm{Z}-\mathrm{X}+\mathrm{Y}=29-2+8=35$

Asked in: MHT CET 2020 (14 Oct Shift 2)

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