 Right on next, stability of carbocation that is plus i effective, carbocation increases when it is surrounded to, stability of carbocation increases when it is surrounded to more number of alkyl group. R s will be what this comes over here, R s pi sigma positive charge type 1 and it gives you this, which one is more stable? First one, because it is 3 degree, 1 degree, first one is more stable right and it is exactly the negative charges there, which one is more stable, negative charge, R s is this comes over here, this comes over this carbocation, first one because it is 3 degree and this is 2 degree right. So, this is more stable carbocation, next right down, total number 7, the structure which has more benzenoid form is more stable, the structure which has more benzenoid form is more stable, benzenoid form is more stable, this rule we call it as fries rule, fries rule, more benzenoid form more stable. No, this is not in the order, it is different, this is for cyclic aromatic component. Till rule number 6, 6 it is in the order. This is for the specific compound, when we have cyclic ring like this, this is one structure and when you draw the resonating structure of this you will get, so in this, A is more stable than B, why because A has 2 benzenoid form, you see this is the benzen ring, this is also a benzen ring, so this pipe on is shared with the 2 rings, so that is 2 benzen ring you can see, A is more stable than B, more benzenoid form, so it has 2 benzenoid form here, second one you have only one you see, here we have 1 and 2, 2 benzenoid form. This molecule we call it as naphthalene, 1 and 2 benzenoid, this pipe on is shared with the 2 ring, 1 and 2, here we have only one, this is not a 2 benzenoid form, this is not a 2 benzenoid form, this is not a 2 benzenoid form, this is the most stable, then we have non-aromatic and anti-aromatic, see this aromaticity we will discuss separately, I will just discuss one thing here, molecules you have to compare the stability of RS, aromatic compounds for those compounds which are conjugated as 4n plus 2 pi electron, where n is equals to any number 0, 1, 2 and so on, if this condition is satisfied then the compound is aromatic, conjugated cyclic planar 4n plus 2 pi electron, anti-aromatic all conditions are true, but it should have 4n pi electron and is equals to 0, 1, 2 and so on. First one is see here we have 3 pi bond, here we have 2 and this is 2, but again this rule 1 we won't apply here, because if this compound if you see how many pi electrons it has, 1, 2, 3, 4 and lone pair we also counted pi bond, because it can form a pi bond here, so 1, 2 and 6, so it has 6 pi electrons, for this one it is 1, 2, 3, 4, 4 pi electrons, so obviously this one is aromatic compounds, for n is equals to 1 it is aromatic, for n is equals to 1 it is anti-aromatic and this one is non-aromatic compounds. No, it is only for rain, cyclic conjugated cyclic planar, it is only for cyclic compounds. Non-aromatic related, we will discuss in aromaticity separate, we will discuss that. Okay, aromaticity we again discuss, separately we will discuss this, but obviously this one is aromatic, this one is anti-aromatic and this one is non-aromatic, usually the compounds generally it is not non-aromatic, but stability of non-aromatic compounds and the normal compounds are almost similar, okay. Aromaticity gives extra stability to the molecule at normal condition, anti-aromaticity is unstable, it is unstable molecule is normal condition, right, so obviously this one is most stable and this one is least stable, because the order is aromatic, non-aromatic and anti-aromatic. When you solve some questions and you look at the molecules you will understand, this molecule is aromatic, so it is all about practice, like I said the first molecule is 3, see when aromaticity is there, it dominates all other factors, so aromatic compounds always you have to consider the most stable compound except dancing resonance that we will discuss later, which is just one case, but in general aromatic compounds are most stable, so whenever the compound is aromatic, you have to take that compound as the most stable compound. Sir, so this is the order, as if we have to start, no no no rule 1, 2, 3, 4, 5 and 6, you can consider in an order, but 7th and 8th one, 7th one is simply different benzenoid form, you will understand when you look at the structure like this, you can understand that this is the benzenoid form rule you should not consider the same. No, this and this will, no dominates all of them. And what is 7th and 8th? No, when you have aromaticity it will be more stable, aromaticity overbars everything, dominates everything. Sir, what are the factors in order? Rule 1, 2, 6 is in the order, till 5 it is in the order, 6th one is that one, no carbocation stability plus i minus i, so that is again different, but 1 to 5 is in order. When you solve some question, you will understand what rule you have to apply, there is no doubt in that, so don't worry about that. So aromaticity, these two will be applied when we have cyclic compounds like this, where you can have the possibility of aromatic compounds. Aromatic compound is only possible for cyclic system, open chain rules 7 and 8 cannot apply. This order they have asked many times in the exam, need to be the both of which are correctly aromatic, non-aromatic. Many times they have asked this order, aromaticity like I said we will discuss this separately also, what are the conclusions? Like this rule we call it as the molecule which has this electron, this rule we call it as Huckel's rule, it is Huckel's rule 4n plus 2 pi electron Huckel's rule. There are other molecules which does not follow Huckel's rule, but it is still aromatic, so all those things we will discuss separately aromaticity. So this is the rules we have to follow to find out the stability of resonating structure. Now to find out the bond order like I said, bond order depends upon the stability of resonating structure, the R s which is more stable contributes more and according to that we will have the range of bond order. So bond order we have already discussed in chemical bonding that it has fractional as well as integral value, both bond order possible. So if the fractional bond order possible in the molecule which has resonance.