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Aldehydes are a class of organic compounds which contain a formyl group, represented by -C(=O)H. Most of the aldehydes are colorless or pale-colored liquids with noticeable odors. The aldehydes, containing alpha-hydrogen, can exist as either a keto or enol tautomer, in which the enol tautomer is more reactive. Aldehydes generally undergo addition reactions, by losing a water molecule and therefore it is known as an addition-elimination or condensation reaction. Cyanohydrins, formed through this mechanism, are a route to the synthesis of important alpha-hydroxy acids. Aldehydes are efficient partners in the Witting reaction for the synthesis of olefins. They are also important intermediates in organic synthesis for the preparation of alcohols, imines and amines. Ketones are a class of compounds with the carbonyl group bonded to two other organic fragments through carbon [R(C=O)R'], wherein R and R' are organic fragments bonded through carbon)]. Ketones are either pleasant smelling liquids or odorless solids. Examples of ketones are acetophenone, acetone, butanone, propanone, cyclohexanone, and cyclopentanone. They are widely present in nature (camphor, carvone, progesterone, cortisone, etc). Ketones with the alpha-hydrogen atom in acidic or basic conditions undergo keto-enol tautomerization. The keto form is more stable than the enol form.