AB Tutorial

本站添加: 2026-05-12

[00:00:00]so prepare ation of Halloweens in preparation of higher learning the first easier direct but it can say how much mission we can say hydrogenation reaction so let me tell you from the beginning itself we can prepare calories that is chlorination and bromination we can do now ionization is possible but it is reversible we have to use an oxidizing agent and chlorination is not being done directly because you know it the fluorine chlorine bonded when it is in the rupture it is nothing but it is an explosive reaction so basically we can go for chlorination of probation so how we do that now here you'll be dealing that is benzene plus that is chlorine in presence of now this particular reaction residue it is a halogenation reaction so it comes under what electrophilic substitution reaction remember that we have done it in class element in aromatics that is in benzene properties we have done this particular so benzene plus chlorine in presence of either Fe or fecl3 because of that and in present software da this reaction is carried out and at room temperature and that is ordinary temperature what if this reaction is carried out so what we get it we get it that is a nuclear derivative nuclear means directly it is attached to the benzene that is for nuclear derivatives or it so we get chlorobenzene and xcl so this is your but it's a halogenation reaction it comes under electrophilic substitution reaction where F is here 3 or Fe acts as an but it can say electrophilic reagent it help to the production of electrophile now how it is fecl3 where it reacts with cl 2 it forms fecl 4 minus plus CL plus it forms fecl 4 minus the syllabus if i go a little bit details more details than it is in this way see a single bond CL here a pair of electron comes in because that it is not a free radical reaction because in case of free radical remember if the condition is given here that is what is that condition is required either UV light or imprints of some peroxides or in presence of some chemicals that is not a given yeah so what I have given this to see so now here what is going to happen here like CL minus so fecl3 is a Lewis acid remember if it's a Lewis acid efficiently alright so it takes a pair of electrons that is it takes TL minus to form a CCL 4 - and here and it takes a pair of electrons it becomes an electrophile is positively charged CL plus now if you ask me the mechanism the mechanism in this this in this particular way it is being done we have done it in class 11 once more and saying you this reacts the electrophile now this pair of electron will go here and it is going to form that is here H and here CL all right so now this pair of electron will come inside and what you are going to get you are going to get that is nothing but that is chloro benzene and h plus sign is released this h plus ion reacts to the officiel for - to form fecl3 and HCL so this is the mechanism of the reaction with your selenium class lever once more I put so by this way instead of chlorine I can take bromine also and I can get what you can say that is bromobenzene and give it here okay but here you take it febr3 you gotta get the CLP also no problem but you will not get a ccl4 - in that case if you are doing fecl3 let us see if you are doing it this is I even further than if it be active but if you say no idea you will beginning fecl3 bi- that's so so what in this way what do you find is that this particular reaction is going to take place this is called as and halogenation reaction now what I said you chlorination bro Venetian can't be done I initially fat now you are doing it then what is going to form it is a reversible reaction why because in ideation in straw and HCl which are uniform and you know a chai is strong reducing agent it's a strong reducing agent a Chinese so it will make the reaction reversible so if I want the reaction should be irreversible but if if I want that the reaction should be irreversible then I have to use your own oxidizing agents like I can use here hno3 or HIO three or hgo anything any oxidizing agent I can use it I it is going to so this makes the reaction in the forward action only fight or take this it will become reversible so here what is going to form it is going to form I of benzene I H I now a child what is going to take place now HR you know nitric acid is an oxidizing agent it will give you that is nothing but nascent oxygen nitric acid it is going to form h2o and i2 is being released that means H I is decomposed to either hence it does not get a chance to make the reaction reverse began so that the reaction can be carried out in this way from here we got this lesson talks and prevention with you you can id3 also you can complete the product in that case if you are eighteen hno3 then remember that what you are going to get it that is you are going to get water I agree and happy reduction that's it okay so we are not interested with the secondary product so hence I did not read it so if I wonder the reaction should be irreversible you have to take an oxidizing agent any oxidizing agent you can take it and even do it but fluorination is not possible by this method right so this is your halogenation reaction we can say that thank you very much