Why allene is not planar

Both are sp2 hybridized but one is supposed to be in the vertical and the other in the horizontal plane so as to increase stability. Does this happen in all allenes? Say even in cf2ccf2??? Thanks again!!!!!! The orbitals making up the pi bonds from the center carbon are at right angles to each other px and py so the whole system is twisted by 90 degrees.

In other words, the overall molecule isn't planar. Allene, the parent molecule, has d2d symmetry, meaning that it has the same symmetry as a tennis ball with the lines. Go get one and take a look at it. I would also like to ask, how to generalize or how do we get to know that a molecule is planar or not, from exam point of view. An alkene is two flat sp2 centers joined by a double bond.

Create a free Team What is Teams? Learn more. Why are the two CH2 groups in allene perpendicular to each other? Ask Question. Asked 5 years, 6 months ago. Active 5 years, 2 months ago. Viewed 9k times.

Improve this question. Yunfei Ma Yunfei Ma 1, 2 2 gold badges 16 16 silver badges 28 28 bronze badges. Add a comment. Active Oldest Votes. Let us consider allene and its orbitals: Source.

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Electron Geometry Video Lessons. Problem : The Lewis structure for allene is shown in the diagram.