In CH3OH methanol , the oxidation number of carbon can be determined by considering the oxidation numbers of the other atoms in the molecule. The oxidation number of hydrogen is +1, and there are three hydrogen atoms in the CH3 group. The oxidation number of oxygen is -2, and there is one oxygen atom in the OH group. The oxidation number of the hydrogen atom in the OH group is also +1.Now, let's set up an equation to find the oxidation number of carbon C : +1 * 3 + C + -2 + +1 = 0 3 + C + -1 = 0C = -2So, the oxidation number of carbon in CH3OH is -2.