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VSEPR Theory

Posted: Sat Nov 11, 2017 12:52 pm
by Rakhi Ratanjee 1D
The second rule of the VSEPR Theory Staes that there is not distinction between single and multiple bonds: a multiple bond is treated as a single region of high electron concentration.
Does this mean that the probability of finding an electron in that area is greater than that of having a single bond but the area is just the same, or that the probability itself is the same?

Also, why don't the number of bonds affect the overall structure of the molecule, for example, why do BF3 and CO3 2- have the same structure even though CO3 2- has a double bond?

Re: VSEPR Theory

Posted: Sat Nov 11, 2017 3:28 pm
by Nhan Nguyen 2F
I believe the rule meant that while the electron density in the area of the multiple bonds is greater than a single bond's, the area/region would still be the same.

I'm also wondering the same thing for Rakhi's 2nd question


Posted: Sat Nov 11, 2017 4:52 pm
by Chem_Mod
This is due to the fact that VSEPR theory does not take into account bond multiplicities, but rather how many electron-rich regions exist around the atom. In both of the molecules mentioned, there are only three electron domains around the central atom, so each is trigonal planar despite there being a double bond.