Organic Chemistry (8th Edition)

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

Chapter 1 - Introduction and Review - Problems - Page 18: Problem 1-8 d

Answer

The resonance structures are shown in the picture. The structure 3 is the major contributor.

Work Step by Step

Draw out the resonance structures. The structure 3 is the major contributor because all the octets are complete and oxygens being more electronegative than nitrogen bear the negative charges.
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