How To Identify The Keto Form Of The Following Enol

In this video we learn how to identify a keto form when an Enol form is given. To go from an Enol form to keto, we have to turn OH into a double bond O and turn the double bond next to the OH to a single bond.

Identify the keto form of the following enol.

A. 1-penten-3-one B. (E)-3-penten-2-one C. 2-pentanone D. (E)-3-pentenal