Answer» - Organic compounds mainly contains carbon and hydrogen. Hydrocarbon chain is hydrophobic or oleophilic. Polar hydrocarbons dissolve in water due to formation of hydrogen bonds with water.
- As hydrocarbon part increases, solubility in water decreases due to increase in oleophilic part. Thus hydrocarbons are miscible in organic solvents.
- Water is a polar covalent compound. Alcohols are also polar covalent compounds.
- According to solubility rules, "like solutes dissolves in like solvents"
- This why water cannot dissolve oil, which is a nonpolar covalent compound.
- There are many covalent or non-polar compounds that will dissolve in water like sugar, carbon dioxide gas, and many alcohols, but they do not break into ions the way ionic compounds do when they dissolve.
- They are basically pulled apart into smaller pieces of the same molecule. Usually if an organic or covalent compound is small, it is more likely to dissolve.
- The covalent compounds that dissolve do so because they tend to have parts of their molecules that are somewhat polar (a negative side and a positive side) just like water.
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