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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.
Organic chemists divide all the organic compounds into two groups as aliphatic and aromatic compounds. This separation is based on the way carbon atoms are arranged in the molecule. Aliphatic. Aliphatic compounds in organic chemistry are the non aromatic compounds.They can be either cyclic or acyclic.rganic molecules are molecules consist of carbons. Organic molecules are the most abundant molecule in living things on this planet. Therefore, organic molecules are associated with nearly every aspect of our lives. Therefore, a separate subject as organic chemistry has evolved to learn about these compounds.