The importance of organic molecules have side groups like an alcohol group, an amine group, etc is: They confer specific properties on molecules.
Functional groups are important in chemistry because they are the portion of a molecule which is capable of characteristic reactions. They, therefore, determine the properties and chemistry of many organic compounds.
In organic chemistry and biochemistry, a side chain is a chemical group which is attached to a core part of the molecule known as the main chain or backbone. The side chain is a hydrocarbon branching element of a molecule that is attached to a larger hydrocarbon backbone.
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