(Polar molecules, Non-polar molecules, etc.)
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According to the solution, the pi bonds in C=C are perpendicular to one another in H2CCCH2 molecules, while pi bonds in terminal C=C bonds are parallel to one another in even number of C molecules. Thus, H atoms are coplanar when there are even number of C atoms.
If the pi bonds between the first two central carbon atoms are connected by two p orbitals in the x orientation, the pi bonds between the second and third central carbon atoms have to be connected by two p orbitals in either the y or z orientation. That is what accounts for the perpendicular plane. Subsequently, the hydrogen atoms connected to the third (or odd #) carbon atom won't be in the same plane as the hydrogen atoms connected to the first carbon attom.
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