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Question asking to list the functional groups in decreasing solubility.
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A decreasing in solubility means increasing in hydrophobicity.
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So when you dissolve something, solubilize a substance or a functional group in the water, if it's polar, it's hydrophilic, it tends to have higher solubility.
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Now if a molecule or a substance is hydrophobic.
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It's non -polar.
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Non -polar and is not dissolved in water.
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This is because water is a polar molecule.
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So like dissolved like.
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So which means that a polar molecule tend to have higher solubility in water and a non -polar molecule has lower solubility because it's not it's hydrophobic.
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So let's write down.
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Polar, hydrophilic, higher solubility in water, because water is polar.
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Non -polar, hydrophobic, low, because non -hydrophobic doesn't dissolve in polar water.
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All right, so now once we know this concept, let's look at all the solubilities.
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The one that is most, i would say, hydrophilic, highly polar is the amine.
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So amine is highly soluble.
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So because it is able to form hydrogen bond with water, so it's actually really soluble.
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It's the most polar one.
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And the next one is going to be alcohol.
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It's also really soluble because the oh group, the hydroxyl formed strong hydrogen bond with water.
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The next one is kaboxir group.
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Kaboxi group have r -c -o -o -h.
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Again, it's ionized form, and it has, it's polar, obviously.
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The hydroxide, the coboxer acid has a hydroxyl group and a carbonyl group.
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So basically it can also form hydrogen bond.
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So you can see these are all highly polar group that is able to form hydrogen bond with water.
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The next one is a mine...