Vinegar CH2O ? COH2

we must write empirical formula of $\ce{CH3COOH}$ as $\ce{CH2O}$ or $\ce{COH2}$ ? Alike ? Any nomenclature? 


Somebody told me it was because of bonding, different way of writing the chemical formula mean different way or bonding, but I'm not sure if it is correct or not, 




The reason that acetic acid's chemical formula is often written as $\ce{CH3COOH}$ is that the $\ce{COOH}$ portion of the formula indicates that the compound is a carboxylic acid. You'll also see it written as $\ce{HC2H3O2}$ sometimes, again to indicate an acid, this time through the leading $\ce{H}$.


An empirical formula is only intended to give the relative number of atoms in a compound; writing the formula to indicate the type of compound is not usually done. I would typically follow something like the [Hill System](http://en.wikipedia.org/wiki/Hill_system) for this purpose: carbon, hydrogen, then other elements in alphabetical order, so $\ce{CH2O}$ here. Empirical formulas are never named.


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