Answer
The third resonance structure is the major contributor.
Work Step by Step
The third resonance structure is the major contributor because it has full octets and no charge separation.
Organic Chemistry (8th Edition)
by Wade Jr., L. G.
Published by
Pearson
ISBN 10:
0321768418
ISBN 13:
978-0-32176-841-4
Chapter 1 - Introduction and Review - Study Problems - Page 38: 1-40 b
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