📚 Hydroboration–Oxidation of Alkenes | Class 11th & 12th Chemistry @a2zpractical991

So, children, today we are going to see hydroboration What does oxidation of alkyls basically mean in hydroboration? is that your alkyne, unsaturated meaning double The bonded child becomes your primary. Alcohol is fine, even examples of secondary alcohol Yes, but first let's look at primary alcohols. How alkyne is converted, explained In Gaya hydroboration, the first of all children we have one Unsaturated alkynes will not take unsaturated alkynes An alkyne having an odd number of carbon atoms, then Come on, today I'll tell you something, so pay attention carefully. Look, all the children will pay attention carefully, okay? I've got it. So, taking an example like that, it's BH3. BH double bound BH2 OK and I'll handle this Hydroboration Borane Hydroboration formula It is B2H6, okay. Now listen carefully to this. Your eyes are not fully open to understand the mechanism. You should be here to do this. Come on, come here today. Look, all the children, in B2H6 there are two molecules. BS Tree and BS Tree's Tik A BS Tree BS So, B2H6 will become six, okay, I'll write it down too, There are two molecules of this kind, BH3, BH3; let me tell you about one. You'll understand the rest when I start balancing. Alright, now what happens, kid? According to Boretty's calculation, it's two in the anti. Marconicoff knows this thing. Does anyone know about Antimarkonites? Marconicon's rule, let me tell you what happens here Child Double powdered carbon carries fewer hydrogen atoms. Correct. The partially negative charge goes to the doubly bonded. Carbon carry more number of hydrogen atoms, right? So, check it out. Here, the carbon that has a double bond is this carbon, and it has The greater the number of hydrogen atoms, the more negative the part Where will the child go? The child will go near this carbon. All the work, it will be clear to everyone, you will say, sir, from this It will become negative, so let's go with electronegativity. If you go from left to right according to the property, Electronegativity increases, hydrogen initially appears It's known to everyone, and later you become the boron. It's done, it will go, that boron is your partial negative. It will be and hydrogen, what will happen to your partial positive now Where will the child/remains who will be内蒙古 the negative part go? Double-bonded Carbon can bond with a greater number of hydrogen atoms. Okay, okay, send it over. If I send this here, if When I send this here, the child shifts this bond over here. It will become clear, alright, so this should look something like this here Write it down I'm fine, okay, just keep an eye on it. See, attach it here, I'll attach it right here. That's possible, okay. Let me attach it here, PStwo, okay? This is single. It will become PS, this will become PSTwo, okay, now the child The bond here was a double bond; it has shifted here. It's done, minus minus, what is this, look here, this, this Negative is positive, so if H comes out, then the child would be H had come out positive, that one near the minus sign. What will happen to A? It will connect. Then, what will happen to one H? It will become two Hs. So it could also happen here, so it could also happen here, meaning you Here are three molecules, let's take one more molecule I'll tell you the reaction—this happens when it's negative, negative, from the firecracker, where? It will become connected, yes, the doubly bonded carbon carries, more hydrogen atoms Right next to the atom, okay? Alright? Alright, kid, look here—this is the very essence of positivity. The property will be very good, so it's due to the vote. The entire electron in the inductor will be polarized on this side. Alright, clear enough. Let's go, let's go. Look, now I'm writing. I'm the one who likes B2 to single bond B2, okay, that's right. That's where I subscribe. The one who came out as plus is this, this is mine. It's taking the electron here. Subscribe to Exactly for you Shows the formula written out Hmm, look how I am It would have gone here now Your Boron will connect. Connecting your Boron. Okay, boron, how much time is it? It's two o'clock, okay? So I Here, look, I'll write something like this for two times its Check the balance; balance it with two and balance it with three. So, look, this 3 2 go 6, this has become like molecules in time, 6 It has become time as a reactant, and the balance has become 6 times. And I also need to balance 2 boron, so I've put it here 2 written, then 2 boron, what happened to my balance? It's balanced now. Everyone got it, okay sir, everyone got it, brother Is it dangerous? Okay, let's see what's next. What did I say, kid? It doesn't convert into a primary alcohol. Converts it into a primary alcohol To convert a primary alcohol apply certain reagents or catalysts We will apply the reactant, sorry What will this be like H2O2 H2O2 in the presence of KOH Everyone will know how H2O2 breaks down now. Yes, OH There will be a break in 2 OH, okay? Now listen carefully. That would be your modal number, and this is the number off. Molecular has become three molecules here, please. Molecules, you must know, right? Look, what is this? Look, what is this B? The charge above boron is a plus 3 charge. And what is above OH, minus one Then the child will take a boron 3 OH from here. How many OH will it take? It will take 3 OH. So I'll have to balance this with 3. Who will have to balance it, 3? Look, I'm just writing it by breaking down 1 OH, H2O2 There's no need to worry too much; it's fine here. Look, what will B do? Reacting with 3 OH groups What will be made here? Listen carefully. What are you going to make here? OK, tell me what you're going to make? Like B(OH)₃, okay, these three have gone, now this one here There are 3 OHs, kid, these will be substituted here. So what will remain for you, listen carefully, what will remain for you, 3 times, 3 times, Here will be your OH, this OH is so much time here three times, what can you say about this propanol Propanol, okay, so on the primary carbon you're looking at the alcohol It becomes a simple reaction for the child to scare you There's no need for it to be, what is it that you have, your alkene? Meaning, unsaturated alkene is correct. In it, you have primary Which alcohol is primary? It will be necessary to react with reaction if B2H6 is used as hydroboration, correct, just like hydroboration If you do it, go 3-2; then this will also balance out twice. The 3-time molecule has also become balanced; after that, you don't need to do anything. Reacting with H2O2 and KOH That is the peroxide. Alright, this needs to be taken 3 times because there are that many molecules. And boron also has a +3 charge on top. So, OH has a minus 1 charge above it. Reacting with 1 B 3 OH It will produce B(OH)₃, correct? And it has already been prepared right here. Your primary alcohol is left. Just like this simple chemistry experiment Or to study chemistry lectures Follow up on the 8-8 practicals Don't forget, thank you