Question

Which one of the following complex species does not obey the EAN rule?

• A. $\left[Cu\right(CN{)}_4{]}^{3-}$
• B. $\left[Cr\right(N{H}_3{)}_6{]}^{3+}$
• C. $\left[Fe\right(CN{)}_6{]}^{4-}$
• D. $\left[Ni\right(CO{)}_4]$

Answer 1

The correct option is B $\left[Cr\right(N{H}_3{)}_6{]}^{3+}$

$\left[Cu\right(CN{)}_4{]}^{3-}-$36
$\left[Cr\right(N{H}_3{)}_6{]}^{3+}-$33
$\left[Fe\right(CN{)}_6{]}^{4-}-$36
$\left[Ni\right(CO{)}_4]-$36