No, the atoms in buta-1,3-diene don't stay on the same plane due to steric repulsion, infract they change and rotate their planes and lie in separate planes.
What is same plane?
Since atoms with a pi bond cannot spin, they will all be in the same plane if they have a double or triple bond. The atoms also lie in the same plane if they are either trigonal or square planar.
Diatomic and triatomic molecules, as well as those that, with the exception of hydrogen, only exhibit sp2 and/or sp hybridization. Trigonal planar molecules (BF3) and typical diatomic molecules (CO2) will both be in the same plane.
The C-H bond twists as a result of sterric repulsion, moving the hydrogen atoms further from the molecular plane (like Ortho effect). However, there would be little to no sterric repulsions in the case of trans 1,3-butadiene, causing all atoms to lay in a single plane.
To learn more about same plane from the given link below,
https://brainly.com/question/5830175
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