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Explain why this statement is true: "Iftwo spots in & chromatogram have the same Rf values they may be the same compound. Ifthey do not have the same RC; t...

Question

Explain why this statement is true: "Iftwo spots in & chromatogram have the same Rf values they may be the same compound. Ifthey do not have the same RC; they are not the same compound: (T0)

Explain why this statement is true: "Iftwo spots in & chromatogram have the same Rf values they may be the same compound. Ifthey do not have the same RC; they are not the same compound: (T0)



Answers

How would the compounds in each pair differ in their IR spectra?

In question 62. They give us several pairs of compounds, and they want us to determine whether or not these pairs of compounds are identical and an tumors dia hysteria MERS constitutional I summers or not any ice, um, er of each other at all. As you recall, an anti immerse will be mirror images of each other. Identical just means that the same molecule dia stereo members means they have at least two stereo genic centers. And they're not super imposible constitutionalism. Er's means that they just have the same chemical formula. And then not I summers. It all means they would not have the same chemical formula. So for the first two, we have these structures. We have what appears to be the same molecule. However, in one case we have this carbon coming out of the plane, and in the other case, we have this carbon going into the plane. So because they have the same structure, same chemical formula, we just have a difference in whether it is an R or an s configuration for the stereo genic center. Then, by definition, these would be an anti immerse of each other. We could prove that by taking this molecule here and flipping it 180 degrees. If we flip it 180 degrees that this carbon is now going to be coming out of the plane and it will appear is the mirror image of this one for the next pair. We have these two molecules. They obviously do not look the same so they can't be Dia Steri emerged. They can't be identical and they can't be an anti Immers. But they still could be Constitutionalist Summers if they have the same chemical formula. This one has seven carbons and 14 hydrogen. This one has seven carbons and 14 hydrants. Hydrogen. So these air constitutionalism er's of each other for the next two molecules, We have this one where the O. H. Is coming out of the plane, the hydrogen going into the plane, and then we have the ohh going into the plane and the hydrogen coming out of the plane. But off of this carbon, we have a C H O group in off of this one. We just have a metal group. So if we were to draw the next structure which looks like this carbon going into the plane coming out of the plane. Then we've got our methyl group carbon, our sorry hydrogen going into the plane and the hydroxyl group coming out of the plane. As they're written, we see that they are not stereo I summers of each other. We see that I'm sorry. They're not an anti immerse of each other. This is attempting to be the mirror image, but we have a hydroxyl group going into the plane and the hydrogen going into the plane. However, if we look at this carbon, we have ah, hydrogen going into the plane. And over here, we have a hydrogen going into the plane Hydroxyl group coming out hydroxyl group coming out. So this ends up having a mirror image of this. But this carbon is not the mirror image of this carbon, so they can't be in an tumors, but they do have mhm stereo genic centers and they do have the same chemical formulas. So they have to be. They can't be identical. Can't be constitutional because they're not arranged the same. They must be dia stereo murders of each other for the next two. We have this molecule and this molecule we see that they have a different number of double bonds, so they can't be the same. They can't be an ant humorous of each other because they don't look like mirror images because the bonds air in different places so they can't be dia steri MERS. So let's see if their chemical formulas they're the same. This first one has chemical formula C eight h 10. The second one is CH. 12. So these air not even I summers of each other. We then go to the next one where we have this sigh click structure. We see that the first one drawn. Let's see, this is the way the second one was drawn. I took the liberty of rotating this one about 120 degrees. And when I rotate this 1 120 degrees, it now looks like this. And that, hopefully is obvious is a mirror image of this one. So these are an anti Amar's for the next one for F. We have the structure hydrogen coming out of the plane roaming going into the plane, and then we have this structure. And so what I did is just draw it the way it is. But if I were to rotate this 100 and 9.5 degrees this way, I'd still had the bro mean going out of the plane. I would have put the iodine now in the plane so it would appear in the plane here. And then I would have the hydrogen, which is in the plane here now, coming out of the plane. And when I do that, it ends up being the mirror image of this one. So these would be an anti Immers, then for part G. I have this structure and I have this structure. And as they are drawn, we see that if we were to which I did hear, I rotated this. If you compare it to what's in the textbook, I rotated this carbon around this single bond. Single bonds can rotate so that the, um, methyl group that was in the plane going down is now in the plane going up. So I rotated this exactly 180 degrees, which puts this metal group up, puts the borough mean now into the plane and the hydrogen coming out of the plane. When I do that, hopefully it's obvious that You see that this molecule as is, is the same as this one right here. And all I needed to dio was rotate this 180 degrees. Now I have chair structures. Hopefully it's obvious that the stereo chemistry here and here are the same, but different here and here. So if we have to steri agenda centers and one of them is different than by definition, we would have a to die a stereo MERS. However, what's different with this is this Steri, a genic center here, has one group that it is equal to the other group. This group is equal to this group. So we would say that these are a Cairo and simply just our constitutional I summers of each other because neither one of these would really be considered stereo genic centers. Now, if we look at I, we have two molecules that do look completely different from each other. However, one is written in the chair structure and one is not. We have both of these metal groups coming out of the plane and when written in the chair structure, we have one going down and one going out. So this would correspond to cysts. This would correspond to trans. If we have system trans arrangements, these would be die Osteria MERS of each other. Now for the last one J, we have this structure and we have this structure and hopefully you notice they're not the same molecules here. The br is attached, Teoh a carbon here, the briars attached to the central carbon. So if they have the same chemical formulas, they would be Constitutionalist Summers, which they do. If they had different chemical formulas, they would not be I summers of each other.

Since podcast, we have two different molecules. So we have the molecular formula. We've got C six h 12. So this has a double bond present. You can tell from the formula already, So we have a double bond here. 123456 Yep, that's the correct number of carbons. And then we have C six age 14, and then we had a missile chain. So I summers are compounds that have similar molecular formula. However, they have different arrangement of atoms and space. So ison is same molecular formula, different arrangement of atoms. So now that we've got our two structures to consider on our definition for a nice Emma, so you can see that we do not have the same molecular formula. So that's what we do not have Iceman's because second structure has two more hydrogen than the first

Hello here, Sorry that we cannot help you to answer these questions because you didn't provide us enough information to solve this problem. You ask us to explain why these two molecules are not ice on MArs, but you didn't provide the structure for the ice summers. So we are. I actually don't know what you are talking about. So, um these are you can just cancel this question or you can just provide the structure of the molecules or just name the molecules in the discussion so that we can help you to answer the questions. And thank you.

Hillary wanted to redo Chapter 19 problem. 46 minutes for Masses. Explain why the P K of compound is lower than a P K's of both Compound B and C, so let's look at Compound Ace. Remember, lower the peaky and stronger the assets. So obviously, Compound A has the lowest P case. It wasn't a strong is acid and what we know about the acidic strength will and stronger the acid that more stable conjuring base the ways you can stabilize the contract bases of three ways Number one Putting a negative charge Intellectual negative auction. Adam Look on all of them. Do Resident Lee stabilizing the negative charge through the car boxful group, which all of them do a number three inductive stabilization off the negative charge to inductive. Pull a left tendency towards some sort of electoral negative Adam that is, in close proximity to this car box Late group, which all of them also exhibits. So then, what's the difference in acidity? Well, we see that the karmic selic acid in and see our place in the same position they are next to the left. A negative Adam option Major Jin. So why's a more acidic than see Well, it's because oxygen is more election withdrawn and more electoral, electoral negative than nitrogen. Therefore, oxygen will have a greater electron. Withdrawing, inducted, effects and stabilization of his contrary face been in this molecule. See? So that explains why A's more acidic than see. But I would be well, pull them have oxygen's. But now the position of this car looks LaGrassa Group is different. This one and B is one carbon away, while the one in a is directly adjacent to one another. So the difference in the Andes is very simple. It's just because the distance is greater towards this election of drying. Group is goingto have, in a less of an effect inductive destabilizing the contract base than in a so because it has this further away, it's gonna be less efficient in stabilizing the continent base as compared to a


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