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Stability of Fully Filled and Half Filled Orbitals

Which of foll...

Question

Which of following coordinate complexes is an exception to EAN rule ?
(Given Atomic Number: $P t = 78, F e = 26, Z n = 30, C u = 29$ )

[P t (N H_{3})_{6}]^{4 +}

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[F e (C N)_{6}]^{4 -}

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[Z n (N H_{3})_{4}]^{2 +}

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[C u (N H_{3})_{4}]^{2 +}

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Solution

The correct option is B $[C u (N H_{3})_{4}]^{2 +}$
$[C u (N H_{3})_{4}]^{2 +}$ is an exception to EAN rule.
$E A N = Z - X + Y$
$E A N = 29 - 2 + 8 = 35$
The atomic number of nearest noble gas $(K r)$ is 36.
Note:
$[P t (N H_{3})_{6}]^{4 +}$
$E A N = 78 - 4 + 12 = 86$
The atomic number of nearest noble gas $(R n)$ $i s 86.$ \displaystyle [Fe(CN)_6]^{4-}\displaystyle EAN = 26-2+12=36 $T h e a t o m i c n u m b e r o f n e a r e s t n o b l e g a s$ (Kr) $i s 36.$ \displaystyle [Zn(NH_3)_4]^{2+}\displaystyle EAN = 30 -2+8=36 $T h e a t o m i c n u m b e r o f n e a r e s t n o b l e g a s$ (Kr)$ is 36.

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[C u (N H_{3})_{4}]^{2 +}, [C u (e n)_{3}]^{2 +}, [C u (C N)_{4}]^{3 -}

[F e (C N)_{6}]^{4 -}, [F e (C N)_{6}]^{3 -}, F e (C O)_{6}

[N i (N H_{3})_{6}]^{2 +}, [N i (C N)_{4}]^{2 -}, [N i (C O)_{4}]

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[C o (N H_{3})_{6}]^{3 +}, [C o C l_{4}]^{2 -}

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F e = 26, C r = 74, N i = 28

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