Question

Which of the following does not follow EAN rule?

• A. $V\left(C{O}_6\right)$
• B. $Cr\left(C{O}_6\right)$
• C. $Ni\left(C{O}_4\right)$
• D. $W\left(C{O}_6\right)$

Answer 1

The correct option is A $V\left(C{O}_6\right)$

Effective atomic number: Number of electrons of Metal + no. of electrons donated by ligand In option A$\left[V\right(CO{)}_6]$ V contributes 23 electrons and each CO donates 2 electrons. Hence, EAN comes out to be 35 which is numerically not equal to the atomic number of the noble-gas element found in the same period in which the metal. Hence option A is correct.