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 g

Answer

The second and the third structure are the major contributors.

Work Step by Step

The second and the third structure are the major contributors because they have full octets and more pi bonds than the first one. Moreover, they are equivalent in energy.
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