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 112: Problem 3-18

Answer

$trans-1,2-dimethylcyclopropane$ is more stable. See the attached image.

Work Step by Step

In the cis isomer, the two methyl groups are eclipsed with one another, creating strain in the molecule, whereas in the trans isomer the methyl groups are eclipsed with hydrogen atoms, thereby the strain is less and the trans isomer is more stable. See the attached image for clarity.
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