Answer
The first two structures are major contributors.
Work Step by Step
The first two structures have full octets and less charge separation. Both have same energy and hence both are major contributors. The third one is minor contributor.
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 b
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