Although this seems tedious Lewis structures really do help us determine the sha
ID: 589297 • Letter: A
Question
Although this seems tedious Lewis structures really do help us determine the shape of a molecule in three dimensions. Review the representations of the methane molecule on page 3 of this lab then compare the four different representations of the more complex sucrose molecule below H2OH HOCH HO C-O O-C-CH2OH OH HO HO H OH OH Diagram A has all the atoms bonded properly but diagram B is a much better approximation of the geometry around each of the carbon atoms in the 2 rings and looks more like 3D (C) and space-filling models (D)Explanation / Answer
My choice is MODEL- C is best one to show it to my boss.
As Model-A represents a 2D model, no information on how the molecule really exist. It's just simply a planar molecule, most of the compounds do not exist in that way. It lacks stereochemistry, geometry optimization, orientation of atoms in the space. Its just a elementary school black board chemistry.
Model-B although showing stereochemistry, but it lacks geometry optimization, orientation of atoms in the space. Its ok for high school chemistry which requires stereochemical synthesis and chemical reactions like SN1, SN2, E2 elimination reactions.
Model-C is perfect in all aspects like stereochemistry, geometry optimization, orientation of atoms in the space. Moreover it looks like it was taken from energy minimized global minima structure from molecular modelling studies or from X-Ray crystallography structure.
Model-D looks colorful and sturdy, but difficult to understand the above aforementioned characteristics as it is bulky that does not allow us to see back side atom interactions with middle one as space-filling masking those things. For small molecules like H2O, CH4 it will be suitable, but for bigger molecules always Ball & Stick model (MODEL-C) is perfect choice.
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