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In chemistry, an ester is a compound derived from an acid (either organic or inorganic) in which the hydrogen atom (h) of at least one acidic hydroxyl group (?oh) of that acid is replaced by an organyl group (r ?) [1] these compounds contain a distinctive functional group. Ester, any of a class of organic compounds that react with water to produce alcohols and organic or inorganic acids Esters derived from carboxylic acids are the most common Learn about the different types and reactions of esters and more in this article. An ester is an organic compound where the hydrogen in the compound's carboxyl group is replaced with a hydrocarbon group Esters are derived from carboxylic acids and (usually) alcohol. Esters are also the building blocks for an important class of polymers known as polyesters These materials, characterized by repeating ester linkages in their molecular chains, are widely used in textiles, such as polyethylene terephthalate (pet) fibers, and in the production of plastic bottles. Key takeaway an ester has an or group attached to the carbon atom of a carbonyl group. The general structure of an ester is rcoor', where r and r' represent alkyl or aryl groups Esters are derived from the condensation reaction between a carboxylic acid and an alcohol, resulting in the elimination of water. This could be an alkyl group like methyl or ethyl, or one containing a benzene ring like phenyl. An ester can be thought of as a product of a condensation reaction of an acid (usually an organic acid) and an alcohol (or phenol compound), although there are other ways to form esters.