Question

Which one of the following does not follow EAN rule?

• A. $Fe(CO{)}_5$
• B. $V(CO{)}_6$
• C. $K_4\left[Fe\right(CN{)}_6]$
• D. $M{n}_2(CO{)}_{10}$

Answer 1

Answer: (B)

$V(CO{)}_6$

For $Fe(CO{)}_5$, $EAN=26-0+10=36$. Thus, it follows EAN rule.
For $V(CO{)}_6$, $EAN=23-0+12=35$. Thus, it does not follow EAN rule.
For $K_4\left[Fe\right(CN{)}_6]$, $EAN=26-2+12=36$. Thus, it follows EAN rule.
For $M{n}_2(CO{)}_{10}$, $EAN=25+1+10=36$. Thus, it follows EAN rule.