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As carbon chain size increases, molecule become less and less water soluble. Why?
Can you give me an example of a molecule that illustrates this trend?
Sure, one example is ethanol. Ethanol has a short carbon chain (two carbons) and is highly water soluble. In contrast, as the carbon chain length increases in molecules such as butanol (four carbons) and pentanol (five carbons), their water solubility decreases.