Question

$Co(CO{)}_4$ follows $EAN$ rule by :

• A. Oxidising character
• B. Reduction
• C. Dimerisation
• D. All of these

Answer 1

The correct option is D All of these

$\left[Co\right(CO{)}_4]$
$EAN=27-0+4\times 2=35$
Some complex undergoes dimerisation​ to attain the noble gas configuration​.
$2\left[Co\right(CO{)}_4]\to C{o}_2(CO{)}_8$
$EAN=27+1+4\times 2=36$

Some complex can act as oxidising agent by ​gaining electron​ to attain the noble gas configuration​.
$\left[Co\right(CO{)}_4]+e^{-}\to Co(CO{)}_4^{-}$
$EAN=27+1+4\times 2=36$

Some complex can act as reducing agent by ​losing electron​ to attain the noble gas configuration​.