Answer
Please see the work below.
Work Step by Step
We know that all the four hydrogen atoms $H_2C=C=CH_2$ cannot lie in the same plane as the second $C=C$ bond forms perpendicular to the plane of the first $C=C$ 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 424: 10.73
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