# Electron Pair Geometry in Ibuprofen (Electron Pair Geometry in Organic Compounds)

I am trying to determine the electron pair geometry (and molecular geometry) of some atoms in ibuprofen. The first one I am trying to do is the double bonded oxygen. Ibuprofen is pictured below:

I counted the number of electron domains (steric number)to be 3. I counted the double bond as one and each lone pair as one. It has two lone pairs and one double bond. So this means the electron geometry should be trigonal planar. But I am stuck on molecular geometry. There is no molecular geometry I have found in any chart that has two lone pairs and one bond. Am I making a mistake somewhere? Any help is greatly appreciated!

• I assume you are trying to apply the VSEPR model. In that case you are correct in assuming two lone pairs, a sigma and a pi bond for oxygen, giving a trigonal arrangement in the surrounding of oxygen. Be aware, that this model is very crude and the bonding situation is much closer to $\sigma-\ce{C_{sp^2}-O_{sp}}$, $\pi-\ce{C_{p}-O_{p}}$, $\sigma-\mathrm{LP}-\ce{O_{sp}}$ and $\pi-\mathrm{LP_{inplane}}-\ce{O_{p}}$. – Martin - マーチン Jan 20 '15 at 4:02