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====Primary, secondary, and tertiary==== {{anchor|secondary|tertiary}} Alcohols are then classified into primary, secondary (''sec-'', ''s-''), and tertiary (''tert-'', ''t-''), based upon the number of carbon atoms connected to the carbon atom that bears the [[hydroxyl]] [[functional group]]. The respective numeric shorthands 1Β°, 2Β°, and 3Β° are sometimes used in informal settings.<ref>{{cite web|last1=Reusch|first1=William|title=Nomenclature of Alcohols|url=http://chemwiki.ucdavis.edu/Organic_Chemistry/Alcohols/Nomenclature_of_Alcohols|website=chemwiki.ucdavis.edu/|date=2 October 2013|access-date=17 March 2015}}</ref> The primary alcohols have general formulas {{chem2|RCH2OH}}. The simplest primary alcohol is methanol ({{chem2|CH3OH}}), for which R = H, and the next is ethanol, for which {{chem2|1=R = CH3}}, the [[methyl group]]. Secondary alcohols are those of the form RR'CHOH, the simplest of which is 2-propanol ({{chem2|1=R = R' = CH3}}). For the tertiary alcohols, the general form is RR'R"COH. The simplest example is [[Tert-Butyl alcohol|''tert''-butanol]] (2-methylpropan-2-ol), for which each of R, R', and R" is {{chem2|CH3}}. In these shorthands, R, R', and R" represent [[substituents]], alkyl or other attached, generally organic groups.
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