## Hybridization [ENDORSED]

$sp, sp^{2}, sp^{3}, dsp^{3}, d^{2}sp^{3}$

Sara Juarez 1B
Posts: 8
Joined: Tue Nov 24, 2015 3:00 am

### Hybridization

On page 189 of our course reader, question 6A gives the Lewis structure for amino acid proline and asks for the hybridization for specific atoms of the structure. I am only able to get the hybridization of the nitrogen atom and the last oxygen atom on the far right. I have been using AXE to find hybridization but I can not seem to get the same answers as the textbook, maybe I am overthinking it but can someone please walk me through finding the hybridization of carbon in the ring structure?

Vivian Tan 3F
Posts: 34
Joined: Fri Sep 25, 2015 3:00 am

### Re: Hybridization  [ENDORSED]

Remember that hybridizations involve all areas of electron density, so that includes both bonds and lone pairs.

The carbon in the ring structure of proline has 2 bonds between them, so it means that the carbon must have 2 pairs of lone pairs (to add up to 8 electrons total, to fulfill the octet rule). This adds up to 4 areas of electron density, which corresponds to sp3 hybridization.

Review lecture notes from July 11th on hybridization!:
2 regions of e- density: sp
3 regions of e- density: sp2
4 regions of e- density: sp3
5 regions of e- density: spd3d (or dsp3)
... and so forth.

AXE notation is used for VSEPR and to determine shapes of molecules.

HannahLewis
Posts: 10
Joined: Wed Nov 18, 2015 3:00 am

### Re: Hybridization

Since it has a sp3 density, does that also mean that it has a tetrahedral structure as well?

KelseyKobayashi_2M
Posts: 21
Joined: Sat Jul 09, 2016 3:00 am

### Re: Hybridization

HannahLewis wrote:Since it has a sp3 density, does that also mean that it has a tetrahedral structure as well?

I believe if all 4 positions of electron density are occupied by electrons, then it's tetrahedral, but if 3 of the 4 positions are occupied, then the shape is trigonal pyramidal.

Skolli20
Posts: 35
Joined: Wed Sep 21, 2016 2:58 pm

### Re: Hybridization

The part I'm confused about is how you know that one area of electron density is sp, or that three is 2sp2 etc. If someone could please explain that?