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An alkyl group is a functional group derived from alkanes by removing one hydrogen atom. It is often represented by the symbol R in chemical structures.
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Functional Group: A specific group of atoms within a molecule that are responsible for characteristic chemical reactions of that molecule.
Hydrocarbon: Organic compounds consisting entirely of hydrogen and carbon atoms.
Substitution Reaction: $$\text{A chemical reaction where one functional group in a chemical compound is replaced by another.}$$