Answer
Please see the work below.
Work Step by Step
We know that both the unhybridized 2p orbitals. One form each carbon atom are perpendicular to the $CH_2$ planes. The two ends of the molecule cannot twist around without breaking $\pi$ bond.
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 10 - Molecular Geometry and Chemical Bonding Theory - Questions and Problems - Page 420: 10.10
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