Aldehyde is any organic compound that has the functional group - CHO - attached to the carbon chain.

Here are some examples of aldehydes:



The best known aldehyde is metanal. It is also called formic aldehyde or formaldehyde. It is a colorless gas with a very strong and irritating smell. Very soluble in water.

It is generally used as an aqueous solution containing 40% formic aldehyde, and this solution is called a formalin or formalin. It is used as a disinfectant and in medicine, as a preservative of corpses and anatomical parts. It is used for the manufacture of medicines, plastics and explosives. Also used in beauty products.

O ethanal or acetic aldehyde, or acetaldehyde, has a strong smell and is soluble in water. It is obtained from acetylene. It is the starting point for the manufacture of pesticides, medicines, insecticides and mirrors. Used in the production of acetic anhydride, acetic acid (present in vinegar) and resins.


The word aldehydes should be used to terminate AL, according to IUPAC. The main string must contain the group - CHO and numbering is from that group. Examples:

Methanal or formic aldehyde or formaldehyde


2 - methyl - butanal