Alcohols have a functional ·COH group. The group includes primary, secondary and tertiary alcohols, with one, two and three ·COH groups. Long-chain alcohols (up to 30 carbons) are found as esters with palmitic acid. Glycerol and cholesterol are alcohols. Ethanol, CH3·CH2OH, is an alcohol produced by fermentation and can be used as a source of metabolic energy. It has a caloric value of 29.7 kJ g 1 or 23.4 kJ ml 1.
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