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Ester Definition: An ester is an organic compound where the hydrogen in the compound's carboxyl group is replaced with a hydrocarbon group. Examples: Ethyl acetate is an ester. The hydrogen on the carboxyl group of acetic acid is replaced with an ethyl group. Article. Chemistry.
Hydrolysis involving organic compounds may be illustrated by the reaction of water with an ester of a carboxylic acid; all such esters have the general formula RCOâORâ², in which R and Râ² are combining groups (for example, if R and Râ² both represent the methyl group, CH3, the ester is methyl acetate).