Organic Chemistry (8th Edition)

Published by Pearson
ISBN 10: 0321768418
ISBN 13: 978-0-32176-841-4

Chapter 3 - Structure and Stereochemistry of Alkanes - Problems - Page 121: Problem 3-25 c

Answer

The $trans$ isomer is more stable.

Work Step by Step

In the trans isomer, one conformer has both $CH_3$ groups in the equatorial positions. This conformer has very low energy, so the $trans$ isomer is more stable than the $cis$ isomer.
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