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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.
by Dunee. Ester vs Ether. Ester and ether are organic molecules with oxygen atoms. Both have the ether linkage which is âO-. Esters have the group âCOO. One oxygen atom is bonded to carbon with a double bond, and the other oxygen is bonded with a single bond. Esters are carboxylic acid derivatives and have the group âCOO. Ethers have the âO-functional group. â¢ Ester has a carbonyl group adjacent to the âO-oxygen, but ether doesnât have such.