 Okay, so alkynes are, remember, anything with a C triple bond in it? So we can have a compound like this. Remember, if we have this like this, that means that there's a methyl group or a CH3 group on the end, right? So let's draw this thing out, right? There's a carbon there. So remember, this and this mean the same thing. Okay, so if you didn't get that, a little small. What's the bond angle here? 180. What's the bond angle here? 109.5. Okay, so you should know that I know. Alkynes can be terminal or internal. Remember, the similarities to it, the alkene should be obvious, right? So if you've got this one here, what is this? Well, just tell me, is this a terminal or an internal? Internal. Internal, why? Because you've got two carbons on either side of the carbon-carbon triple bond, okay? Let's draw, you guys draw a terminal one and I'll draw a terminal one. From here, it's terminal. Structure, draw the Lewis structure of this thing. Everybody draw the Lewis structure. Like this for you. You do, remember? They're internal. Terminal. Why? Because they can't add something else, so it's the end of the chain. That's what terminal means. It's like the end of the line, like if you're on a train, go to the terminal station. But since you can't see them on the video. Any questions about that? Okay.