Question

The effective atomic number of iron in complex $\left[\right({\eta }^5-C_5{H}_5\left]Fe\right(II\left)\right(CO{)}_{2}Cl]$ is:

• A. 36
• B. 46
• C. 39
• D. 40

Answer 1

The correct option is A 36

$EAN=$ [atomic number of metal] $-$ [number of electrons lost in formation of its ion] . $+$ [number of electrons gained from ligand]. The effective atomic number of iron in complex $\left[\right({\eta }^5-C_5{H}_5\left]Fe\right(II\left)\right(CO{)}_{2}Cl]$ is 36.
$EAN=26-2+12=36$