Consider the molecule allene c3h4 skeleton h2c c ch2 a draw...

Consider the molecule allene C3H4 (skeleton: H2C-C-CH2). a) Draw its Lewis dot structure. b) Then give a valence bond description of the bonding in allene. Include a description of the hybridization (if any) of the three C atoms, describe which orbitals overlap to produce what types of bonds , describe the overall geometry of the molecule and draw pictures as necessary for clarification.

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00:01 Okay, so i'm going to start with the skeleton h2c, bonded to c, bonded to c, so c plus two h's, the single bond of c, the single bond of c, which has two h's.

00:23 And i'm going to draw its lewis dot structure, so i need to add either loan pairs or additional bonds here.

00:30 And so how many electrons do we need to have in total? we need to have four times three.

00:36 For our carbons, that's 12 electrons, and then four times one for our hydrogens.

00:42 That's a total of another four electrons for a total of 16 electrons.

00:48 How many do i have here? two, four, six, eight, ten, twelve.

00:53 Okay, so i need to add four more electrons.

00:57 How should i add them? well, let's notice that this carbon is two electrons short of a full octet.

01:04 So it's this one, and this one is four.

01:07 Electron short of a full octet.

01:09 So if i add a bond here and a bond here, everyone will have a full octet and everyone will be neutral.

01:15 So that's what i'm going to do.

01:18 And that will give me my total of 16 electrons.

01:22 Okay.

01:28 So a valence bond description, description of the bonding in electron, an aline.

01:34 All right.

01:35 So this is a sigma bond and a pi bond...

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