AB Tutorial

Added: 2026-05-12

[00:00:00]now axis that is me a blunt which is rection which is zero and theoretically how do you even it out with the government compares optically active or not now if the components optically active you having two types of optical optically active compounds what is that one is enantiomers another is diastereomers what I said you one is in an EO months and another is daya Stelio months in an yogurts means when the mirror image of the compound is not super impossible or it when that means of course they are not super impossible of course you can see a boca but then this particular compound has got a mirror image this compound has got a given image but when this compound does not have a mirror image that is said to be asked - students in both of the village is not superimposable that's true but here that we have got a mirror image and here we do not have a mirror image more of it you can see my notes I have given to you in class 11 when I was teaching you in that I have given it a difference between action as a dashed you must have given to you and I have told you not about it but it's silly yeah I see now how it is mirror image and how you don't have a mirror image let's say an example is example yeah like let us take here ch3 here let us take CL here let us take BR here let us take H here wait and there is ch3 yeah you can say C is 3 or you can say C 2 H 5 so as you can see these two are parallel monitor attached to four different atoms or groups now I am going to take the image of its image so now you get it here I will get BR and I will get CL and there it is ch3 here same thing I will get h and here it is H and here I will get C 2 H 5 all right so this one second one so you can see this is the mirror image of this as you can see this is don't forget to put that sweet man all right so you have any bigger than me but I say not you must have got a bigger image now I am putting it another way the next one I'm drawing it let us say I am doing it here Co H here it is CL here it is BR and here it is or let me put it here I and here it is C and here it is let me put it here CL don't have the space here unfortunately here voyage and here deceased okay so this is everyone so what do you find aside now of course we have a mirror image of this also will have a great image now this is the fourth one will have it but I don't have a space you can draw it and see whatever do is that just simply change the right and the left you have to change it which will come here and sale will come here that's in the very rich so what he sees that what is the bigger image of to listen carefully what is the mirror image of two is to the mirror image of three is to the middle image of three no he is one the middle region free No so why to are enantiomers two and three are - to give us one and three are - streamers suppose you will be having another one for you do it and see no hope they are also known as one dad's Cheerios I think you got it now what I learned shimmers and - it was in action birthday I've got a little bit interpreter but a stream us does not we can smash okay so this two are optically active but it can sit compounds for SRU optically active isomers are two types in an Shiva sometimes students fine the Nexus after that we are having that is optically inactive compounds are also do theirs what is that Masuka found side race meat mixture missile compound a circle for means better compound is optically inactive due to internal compensation when compound is optically inactive due to internal composition what do you mean canonical partition the internal arrangement of the compound is such that that it is 50% it's true and 50 person legal means half the compound rotates was right and the other half would it's what's left the net rotation will be 1 0 hence the compound is said to be optically inactive in nature so what is that is a real internal opposition the internal arrangement is such that all right so here in this case we're having a plane of symmetry we are having it how I show you an example here HOH here let us say here we are having voyage here H and here we have a ch3 so you can see this is a plane of symmetry this overlaps about this this is a plane of symmetry this line is a plane of so it is dotted line which I've drawn it here is a plane of symmetry so this compound is said to be miss soap compound the internal arrangement is such that it is optically inactive due to internal composition 50% extra 50% leave now tell me to Resnick mixture what is that for that purpose secretary will be more now reasoning mixture is optically inactive due to external compensation external opposition means externally you are adding 50% extra for power and 50% leave over a mixture between 50% extra and through people you so many tradition is what is if so mr. compound is optically active into internal composition pretty slick mixture is optically inactive due to external composition and the phenomena is known as a racism ization it is known as racism ization much here I will not tell a picatinny about resolution resolution means what that is it is a process by which you separate the next random Evoque apart that's the last dissolution means you are having next one to go compound a mixture you are having it and the process which you are adapting to separate electronic that is unless the resolution their set ups that is an itself it cannot be resolved you might have heard the world it cannot be resolved use the world resort means it cannot be separated into extraño in which is in this a missile hand in case of risk minister you okay there are people in active in nature now Nexus what if I decide when you are expressing an optically active compound so we have got two types of expression that also discuss one is the Fischer projections Fischer projections is that for example you're having lactic acid in this way let us say your hobby this is your lactic acid this is your tiny carbon atoms so here in case of physical Fischer projections will do it in this way we don't represent the central carbon atoms we write in a ch3 here is H here just go H and here it is C O H so this is your Fischer projection this is a type of representation of an optically active compound another easier three-dimensional structure three-dimensional in three-dimensional structure what we do is that we draw that is ch3 in this way let us say and here H we are bringing this way and let us say we are having a dash dash means this one a line we are having this is one as a - this is voyage and we are having a wedge wedge means this is a dark to light let us see which what does it mean that means this - gross are on the plane of paper what I say this is three-dimensional representation this is a TPS three-dimensional this you are on the plane of paper now here the - that is you can see is that it is nothing but it is inside the plane of paper in setting set and this is outside away from you but it's Co H it is that one is away from it this is on the plane of paper this is inside H group is three-dimensional represented three-dimensional representation are two-dimensional okay and this particular one is not but it is away from me away from this upward it is alright this is so this is recent projection this is two dimensional but n City presentation this is your reports two dimensional representation okay now here will be coming here to it that is what is your attention another reserved inversion a copy word inversion about word valid inversion if you remember it in sn2 but you can say this is sufficient if you fill it a reaction I have talked with you that is sn2 reactions that is random English so that I am going to show you the first I'm going to tell you about the retention retention means when the Stelio isomeric form is being retained after the chemical reactions taking place CU isomeric comics whatever the representation was the air of the reactant after the reaction is taking place the product which is formed it has got the same representation in three-dimensional structure the representation does not change that means that is left and right whatever the group is the end it does not change it remains as it is alright now let me give you an example there are it will be clear to you let us say this is C 2 H 5 this is H this is nothing but CH 2 CL and this is your C address all right now it reacts with HOH it reacts in a charge when it reacts at your church what is going to form is that it's series released and instead of that you're having this an example I am giving you this reaction just an example and this is your nothing but ch2oh and this is your C so what if I decide CL it is written on the same side say o it is retaining its replacing CNN the same set oh it is replacing steel and is retained on the stay inside what are you missing the retaining on the same thing so hence what I said you this is nothing but retention but suppose in inversion what is happening this H will come this side but it then what is that that phenomena is known as inversion you can repeat the reaction will take place in such a manner that H will be coming this side means H 2 h 2 to the side and actually on the other side then what is that unless inversion this is known as hot a retention retention listen carefully voyage he's on the same side as that exhale I have retained which on the same side so this phenomena is called as the retention this is on us but suppose CH 2 inches on this side and H is on the opposite side this other side means left and right it changes then what I showed you this inversion the value of initial inversion intersect the mechanism you are the sole inversions and how the inversion region is taking place I said you the valladon inversion now let us say this is your a retention the product which about it and for this inversion let us say this is the product will be getting it then you see H 2 H of this site and H on this side and this is your CH this is your B let us say a plus B together this on a smart race Mik mixture this is called as rhythmic mixture this honest and the phenomena is known as a racemization what I said you this is retention this one is inversion and when I combine a and B equally and mix it I get an optically inactive compound what is that the less risk mixed mixture the phenomena is honest what a race my position is a as a retention inversion rids my session I hope it is being clear this is about your particle and so mixer thank you