Question

Electron dot structure of propanone

Answer 1

This is the Acetone Lewis structure: also called propanone. It is what we call a ketone. So when you see that "-one", we're talking about a ketone. Ketones will always be a Carbon with a double bonded Oxygen, and Carbons on either side.
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Answer 2

The answer is added below ......... propanone is ketone group so it has a double bond with O but the O atom in this group can only come between two  atoms of carbon.