Answer
The first structure is the major contributor.
Work Step by Step
The first structure is the major contributor because it has full octet and one more pi bond.
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 - Problems - Page 18: Problem 1-8 c
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