let the oxidation number of carbon X.
the sum of the oxidation number of a neutral molecule is zero.by using this assumption
Oxidation number of oxygen is -2.
O.N of Cl2 is 2*-1 = -2
let the O.N of C be x, then,
x + (-2) + (-2)=0
(since the net O.N is 0)
or, x -4=0
The total charge of the molecule must be 0, so the sum of the charges of each of the atoms should be 0.
The charge of oxygen is -2 and the charge of each Chlorine is -1
The charge of the carbon must be 4 so that the negative charges of the other atoms are canceled out.
let ON of c be x.