 Let's try to make another one now How do you make this one from an alkene? So it's going to be from that same alkene of course It's like all the other ones But this time we're going to have Markovnikov's addition of HBR across that double bond So remember HBR, we'll do that. So let's go over the mechanism Just to recall And I like to put the lone pairs in there to help you guys out So the double bond is going to grab that hydrogen because remember that hydrogen is super acidic and makes that double bond kind of basic And that'll knock off that BR like that So now we've got CH3 and the carbocation So methyl group and the carbocation and BR with its full octet of electrons So it's minus So remember we could have had the other carbocation which would have been CH2 and the H down there if it would have grabbed it from that side Or this is a primary carbocation So that's no good So it would prefer to be tertiary And remember we call this Markovnikov's addition What's going to happen now that BR is going to attack that tertiary carbocation as a product So that's how you make that molecule from an alkene