Consider the lewis dot structure that satisfies octet configuration for both "C" and "O" atoms in CO and identify correct statement among the following

(A) Formal charge on oxygen atom is - 2

(B) Formal charge on carbon atom is +2

(C) One lone pair electron is present on each carbon and oxygen atom

(D) Three bond pair electrons are present between carbon and oxygen

Lewis dot structure,

 $\underset{-1}{\overset{°°}{\mathrm{C}}}\equiv \underset{+1}{\overset{°°}{\mathrm{O}}}$

From the above Lewis structure we can say that carbon has a pair of electrons with three bonds with oxygen means carbon has a formal charge of 4-5 = -1. The oxygen formed a triple bond with carbon means oxygen has a positive charge on it.
Therefore, the net formal charge on the carbon monoxide is zero.

Oxidation state of carbon in CO +2  and in O is -2.