I want to determine the carbons that are oxidatized in an organic reaction.
Is it an acceptable way to first figure out the oxidation number of every carbon in reactants and products and then compare the oxidation numbers (for example: $\ce{+I -> +II} =$ Oxidation; electron loss)?* Or is my attempt to work with oxidation numbers false (for example: an aldehyde and keton are on one oxidation level, but their carbon has different oxidation numbers?). Maybe I should go over the oxidation levels of functional groups given in many textbooks as tabulars (but my structures aren't that easy and have not the most common functional groups)?
*I have read in many posts here, that this is a legitimate way — but there is "my problem" with the keton and the aldehyd, as mentioned above.