Organic Chemistry (8th Edition)

Published by Pearson
ISBN 10: 0321768418
ISBN 13: 978-0-32176-841-4

Chapter 1 - Introduction and Review - Study Problems - Page 38: 1-37 e

Answer

The resonance forms are shown in the picture below.

Work Step by Step

The electrons in the lone pair of the oxygen are delocalized. And the electrons in the bond between carbon and carbon are delocalized to the other carbon giving it a negative charge. Then the electrons are delocalized in the ring.
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