Answer
When two groups are trans and at carbons 1&3, one group is up and the other is down, one will be axial and the other will be equatorial.
Work Step by Step
The conformation with equatorial ethyl and axial methyl is more stable. See image.
Organic Chemistry (8th Edition)
by Wade Jr., L. G.
Published by
Pearson
ISBN 10:
0321768418
ISBN 13:
978-0-32176-841-4
Chapter 3 - Structure and Stereochemistry of Alkanes - Study Problems - Page 130: 3-44 d
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