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In chemistry, alcohols are organic compounds that carry at least one hydroxyl functional group (C–OH) bound to their aliphatic substructure. The term alcohol originally referred to the primary alcohol ethanol (ethyl alcohol), which is used as a drug and is the main alcohol present in alcoholic beverages. An important class of alcohols, of which methanol and ethanol are the simplest members, includes all compounds for which the general formula is CₙH₂ₙ₊₁OH. Simple monoalcohols that are the subject of this article include primary (RCH₂OH), secondary (R₂CHOH), and tertiary (R₃COH) alcohols.