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Arrange the following in order of increasing strength of the hydrogen bonds (weakest first)HzNHHzN-HNHZIII Hzo:HOHIV H;N- HOH Il,L,IV,III 8 L,,I,IV L,ivi,iI Il,iv,I...

Question

Arrange the following in order of increasing strength of the hydrogen bonds (weakest first)HzNHHzN-HNHZIII Hzo:HOHIV H;N- HOH Il,L,IV,III 8 L,,I,IV L,ivi,iI Il,iv,I,IIOHz

Arrange the following in order of increasing strength of the hydrogen bonds (weakest first) HzNH HzN- HNHZ III Hzo: HOH IV H;N- HOH Il,L,IV,III 8 L,,I,IV L,ivi,iI Il,iv,I,II OHz



Answers

Arrange the following : (i) $\mathrm{N}_{2}, \mathrm{O}_{2}, \mathrm{~F}_{2}, \mathrm{Cl}_{2}$ in increasing order of bond dissociation energy. [1988-1 Mark] (ii) Increasing strength of hydrogen bonding $(\mathrm{X}-\mathrm{H}-\mathrm{X})$ : [1991-1 Mark] $\mathrm{O}, \mathrm{S}, \mathrm{F}, \mathrm{Cl}, \mathrm{N}$ (iii) In the decreasing order of the $\mathrm{O}-\mathrm{O}$ bond length present in them $$ \mathrm{O}_{2}, \mathrm{KO}_{2} \text { and } \mathrm{O}_{2}\left[\mathrm{AsF}_{4}\right] $$

Okay, so for this problem, when you're thinking about the ability to form a hydrogen bond that's going to be dependent upon your difference and electro negativity between the atom that's forming a hydrogen bond and obviously with the hydrogen, so for example, um you know, you have methanol, so this oxygen is going to form hydrogen bonds. The slow for is going to form a hydrogen bond and this nitrogen is going to form a hydrogen bond. So you want to look at is the difference in the lecture negativity between this oxygen in this hydrogen and from, You know, the book you have oxygen has has an electro negativity of 3.5, Hydrogen has an electric negativity of 2.1. So if you take that difference, it's 1.4 Sulfur has an electric negativity of around 2.58. Um and then hydrogen has an electro negativity or 2.1. So if you take that difference, you get 0.48, Nitrogen is 3.0 -2.1 per hydrogen is 0.9. Yeah, so the higher this difference in electro negativity means that you're going to have a stronger hydrogen bond. So this is actually your strongest and this is going to be then your weakest hydrogen bond. So if you're going to rate them in decreasing order, you would start with your strongest, so you would have um oxygen followed by nitrogen, followed by sulfur.

Question. Number 23 also wants you to use table 17 1 and to put a list of bases in order of decreasing strength, starting with the strongest base first using the table, the strongest base is going to be at the bottom of the table, and it's going to be a product in the reactions that are shown. So we will start with the one that is closest to the bottom of the group that is provided. This is the group of bases in this group. The one that is closest to the bottom is C and minus. Then, as we go up, we see a c l o minus and then continue to go up. We see an H S 03 minus and then from H S 03 minus we C h 20 and then the very weakest base will BCL minus.

Yes, Look at each of these compounds and rank their inter molecular forces. So I have ranked them here for you, I and I, and a stronger than I and I pull, which is stronger than hydrogen bonding, which is stronger than die pulled. I pull. And finally, all compounds have London dispersion if they don't have any of these others. So I would go through each compound in the list, figure out what the strongest inter molecular force is in that compound compared to the others, and go from there because the strongest one is going to be the overall strength of the compound. So if we looked at methyl, um, mean it has hydrogen bonding between the nitrogen and hydrogen. So that is the greatest of the three because the other two don't have hydrogen bombing. Thie coral methane has die pulled. I pole. There is a dye pole between carbon and chlorine that the carbon carbon doesn't have. So this is the next strongest, followed by ethane comparing needs. Three. This compound the car box. Look, asset has hydrogen bonding. So it is the strongest. These two don't. Ah, this carbon eel has a diaper old I pull interaction. There is a diaper between the carbon and oxygen that doesn't exist in this compound. Therefore, this is the next strongest and this one only has London Dispersion forces moving down here. All of these compounds seemed to be the same a method group attached to a halogen. So we're just comparing the dye poles of the halogen Tze and we know that Electra negativity increases as you go up the halogen ro and chlorine is the highest of the three. So it is going to be the strongest because it is the largest diaper moment then the one with bromine than the one with iodide just based on Electra negativity, ese. The greater the election negativity difference, the greater the diaper moment. The stronger the DYP Hold on, hold on our interaction. Finally, sodium chloride is actually an ion ion association. So this is going to be the strongest, um, then methanol because it has hydrogen bonding followed by chloral methane which has a diaper disciple, is it stur

Eso first to understand. Um, what do you tell me? The strength off. You know, you telling left forces? Would you tell me the strength off into medical offices? All right, strength off, Tom. Molecular, uh, forces. You do understand that the more we have, the more we have. You know, the hydrogen bond. Ah, the movie have Ah, the moment that we have, you know, London forces and then forces. Ah, and also, they will have a new additional prominent They pull force. All right, if you have additional permanent, deeper force in united in an element reveling in a compound, the stronger the inter medical forces thes are particular compound will have and because I control have ah ah on increased, um, melting points. A melting point in those sore on increased by one point off this component. So given were given. You're giving helium, right? They've given him the given, um, Milano giving me the no and then and then and given be 10 you tend okay, given between. So this is choice. See, is, uh is a And is this be okay or that this is being returned in Venice? Medalis is be then. Ah, 10 is Okay, So that means that when you look at the structure of helium, helium is just the limbs. Just there is just an element. OK? It doesn't have any bonding. And then we look at ah Milano structure off the venal minimalism Witness He hedged three Ohh! Okay, so it will open up. Open up this structure you'll have We have three religion wounded there you have one oxygen. We have another every gin we have two more. Our business. So So we look at this structure we have any time you have Ah ah Hedren Bonded toe oxygen are bonded to um Nay, Trajan. Alright, are bonded toe foreign this Each time you see these, that means we have ah, hybrid and bone and a structure of the family have this candle born here. So this means we have, uh you have Henderson bonding. Okay. And then whenever I had it in his touch to a nitrogen oxygen off rain, we have a poll we have they pull and those who have dispersion forces. So that means. I mean, I know you have the strongest off inter medical forces, then followed by retained because there's between is just Ah, just a gas. Okay, just a gust with with the this kind off. You know, carbon hydrogen bonding only. Ah, single working over structure. So in the end, out of increasing American forces will have minimal as the strongest. Okay, the decreasing is a decreasing order. Then be 10. Okay? And then list will have here. Helium. Okay, so this is the order is this These order is is decreasing. Okay, decreasing off into medical forces. But then you go this way you will be increasing inter molecular forces. Okay? Increasing into Moakler forces. So among this three b 10 and in helium have the guts is okay. But because his extra five decrease oceans and toward atmosphere


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