No you can't, ethanone doesn't exist. You can have ethanal however.
A ketone is a compound that can be produced by the oxidation of a secondary alcohol - the carbonyl thus has to be on a carbon that aren't "on the edge"
wherever you shove the double-bond-O on a 2-carbon compound it will always be "on the edge" so it will be an aldehyde. Ethanal.