Resonance Effect – Basic Principle and Techniques in Organic Chemistry – Chemistry Class 11

Resonance Effect – Basic Principle and Techniques in Organic Chemistry – Chemistry Class 11


Do Subscribe To Ekeeda Channel and Press bell icon to get updates about latest Engineering HSC and IIT-JEE Mains an Advanced videos. chapter some Basic Principal Techniques in organic chemistry and we are with no topic + R effect and -R Effect. Hello Friends in the last 30 minutes today about the resonance and guess we have also studying the phenomenon of the resonsance by taking the example in that case we have got to know that the resonance means the Delocalization of Electrons but now we are approaching towards a new topic that is + R Effect and -R Effect so this is very related to this one but let us talk about individual. so now we are going to talk about the + R Effecct and – R Effect so let us understand what is + R Effect so when the transfer of electrons is away from an atom or substituent group attached to the Conjugated System it is termed as positive resonance effect or we could call it as + R effect so let me talk about this thing with the help of an example so the example can be so this is an annealing molecule that I have represented over here and because we are talking about plus R if it means the delocalization of electron we could say that they transfer of electron that is away from the substituent and in this case the substituent is the NH 2 so this nh-2 group is been associated to the conjugated system that is the benzene only that do people see over here and okay about the next thing that is the electron transfer will be away from this substrate the reason being that is because the nitrogen is the one that consists of lone pair of electron or this other tool this other two letters that you could see away here so now the delocalization would takes place in such a manner that and since we have also data that is a representation of the electron movement so in this case what will happen is this two electrons will be forming a bond between the nitrogen and the carbon over here and meanwhile this two electrons that are of the two different of carbon atoms and they will jump on to this carbon atom so that is the reason that we could get a product which is or we could get a structure which is like this as we could draw over here so in this case there is the formation of double bond over here so that’s why I would write it over here n never got NH to mean well because the double bond this electrons has form a double bond and we melt the nitrogen is the one which is forming basically a dead permanent or the four it forms four bonds so nitrogen doesn’t form four bonds usually and that’s the reason that it will have here as a positive charge but meanwhile if you could see that this two electrons are be shifted to this carbon atom so making this carbon atom to be negative so that is these and I’m writing here as negative charge and memorize the other loop pile across they’re in their own position so therefore I would write it here as this one but this is not a stable structure obviously that there would be another shifting of letters or delocalization of electrons that we had that we had talked about in resonance so that is a reason that we could see then this minus charge or the one which acquires a lone pair of electron that will be deposited on between this two carbon atoms and the reason that this two electrons they will shift on this carbon atom making the structure to be that is this is the one that will form a bond over here meanwhile this two lettuce has been shifted on this carbon atom making this carbon atom to be negative while this one will have a board over here and again there is a bond over here which was been present earlier but it was not to be affected by the residence till it and there is a double bond n h2 that we could see having a positive charge meanwhile see another residence is also what we could see is the structure and these are the resident structure that I am going and we could see send this two electrons that have been present in the between these two carbon atoms they will shift on this carbon atom and meanwhile this will shift this lone pair of electron towards this nitrogen making this to be having in structure as we could see over here as this one that is it we’ll have a bond over here so it was already as it is and meanwhile we will see there’s this even this will deposit over this case so therefore there will be formation of double bond over here and the electron will get deposit of this carbon atom and meanwhile it will be as it is this for a while suppose if I’m explaining this one so now again this is not a stable structure so what will happen is this electron will deposit on in this two carbon atoms and this one which was having a positive charge that will get fulfilled with the lone pair of electrons and now the structure that we have what is basically it is the one which has and this is a structure that we have and this is what the residence that I was talking about but this was a positive residence that I was talking about the reason behind that is because the lone pair of electron or the electron that was being transferring it was moving away from the substrate and in this case the substrate was NH 2 room and this is the reason and this is because of which we could see the resonating structure as you could see we’re here and that is the thing and talking about the hybrid structure and the habit structure it will be therefore be very much seemed similar to everything that would give the every property of the molecule and that’s the reason that we represented by these dotted lines and here it is NH 2 so this is what I was talking about the positive resonance effect or plus our effect so now this is been done and let us move to the next one that we had an approach for that is a negative effect and what is that techniques give you that also so now let us talk about what is – an effect so it is nothing but when the transfer of the electrons is towards the atom or social group attached to the conjugated system its term as negative resonance effect so or people also call it as minus our effect so let me give you an example in this case also so as we could understand that what is actually – our effect so this is the structure that I have mentioned over here that is a conjugated system for example I would consider fnz and in this case BCD a group that is been attached like this so this is the Nitro group that is been attached over here and what we have to do is we have to shift the electrons but towards the atom or towards the group that has been attached to this conjugated system so now this oxygen consists of lone pair of electrons as we know and making this option to be more into negative and so that is the reason that electron shifting would Express in such a manner that this two electrons that are because of one of their own is a foxing and one of the electrons of antigen that will be shifted towards the oxygen atom and so as to fulfill this thing what we could say that this two electrons will also be shifted towards this nitrogen atom so as we could see that the shifting of later on takes place between the nitrogen and the carbon so therefore the resultant structure that we could get is because it is the thing that we are talking about the nestle ending structure is therefore a resonating structure would be formed over this case in this case this two electrons are in that position as it is so there’s no dilution of electron to yet and meanwhile this one will form a double bond and this one will have n and this one will have o and because of the two letters has shifted of this oxygen so therefore this version would be negative but meanwhile if you could say that since the electron has been moved to stress to form a double bond between nitrogen and carbon over here so therefore this one would be the one which is which will form positive charge so that is what I would write over here so this I have discussed away so long so as to stabilize this one what we have to do is we have to dentists we have to ship the electrons and so be nice if the electrons move in shift of this one so we could see that the positive charge would be acquired or this one or this one so that’s the reason that we could see then again the resonating structure would be occurred over here and again there is a there will be photoshop double border over here and meanwhile the positive charge will be on this carbon atom so this carbon atom was as it is so I will keep it as it is and talking about this one even this nitrogen is forming four months so again this will what would be the positive so talking about the next one that is this one would be as it is so in the shifting of this two electrons will be on this carbon atom because of to neutralize this positive charge so meanwhile suppose if this electron or these two electrons suppose if they are deposited on between this two carbon atoms we could see you see a resonating structure that is where if we could find in double bond over here so this was the one as it is but this is the me one that has been found over meanwhile this one will have a positive charge well the upper one that would be as it is I have to mention this one has a negative charge so therefore this is M and I print it has o minus and so as to stabilize this one obviously that this born would form between this two and even this would approach here so therefore the structure that we have got finally after resonating or after the delocalization of electron will be the double bond will be over here even the double one would be here and the double bond will be here and we measure this one we carbon-nitrogen single bond auction over here and this is the formation of bloom on that we could see you away so this is the similar structure to that of the earlier one but this is not the respirating structure this all are the destinies say that you could see over here and we also draw the hybrid structure of this one so the difference between the plus side effect and – artifact is I will show you in this case then so you could see that the negative charge are present on the ortho position or in the better position making this a group to be group will have an attachment of the that is a electrophile and that’s the reason that electrophilic substitution will take space on this ortho position or else para position and you know the ortho position let me not even you are talking about a molecule in ten tails of showing – artifact so this are the positive charge that is we know that is in showcase in the plus ortho position and in the pineapple should mean well when we are talking about the electro film electrophile so electrophile link that is a letter filling reaction would take space or substitution putting space on the meta position because of the electron density is competitive mood then that of the ortho and then that of the Bearer so therefore when it comes to electro Philip substitution for a guru which is showing that is a plus R effect then it would be occurring at ortho and para but when it comes to a minus artifact it means the Alpha solution will take space on the mind ablution so that one it also besides the reactivity of a particular substance and based on the substitution and that is what I wanted to talk about so this is what the plus side effect and – our effect was with an example that I have shown kiss for you so there are many other things that we could also mention for the one which is Russell if it and the one which is – side effect but this was a few example that I was I wanted to showcase so thank you friends for watching this video I hope you have liked this video and you about to study this video very clearly so I hope you’ll share this video with our friends and yes don’t forget to subscribe II get a 7 thank you so much

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