Answer
The last two resonance forms are equal energy and are major contributors.
Work Step by Step
The last two resonance forms are major contributors because the negative charge is on the electronegative atoms.
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 c
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