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The chemical formula for ethanone is CH3COCH3.
CH3CO-OH (acetic acid) has 10 valence electrons. The carbon atom contributes 4 valence electrons, each hydrogen atom contributes 1 valence electron, and the oxygen atom contributes 6 valence electrons.
CH3CO3H is the chemical formula for acetic percarbonic acid, which is used as a bleaching agent in some cleaning products. It is a peroxy acid with a structure similar to hydrogen peroxide, but with an additional acetyl (CH3CO) group.
Iodoform is used in the iodoform test to detect the presence of a methyl ketone functional group. When Iodoform reacts with a methyl ketone in the presence of a base and acidic conditions, it forms a yellow precipitate of iodoform, which confirms the presence of the CH3CO- group.
Since propanal is an aldehyde and 2-propanone is a ketone you can use the Jones reagent which will oxidize the aldehyde to a carboxylic acid. This will cause a green salt to precipiate. The 2-propanone should have no reaction and remain unchanged.