The significant difference between aldehyde and formaldehyde is that the aldehyde contains an R group attached to a CHO group, while formaldehyde does not have an R group. The general chemical formula of aldehyde is R-CHO, but for formaldehyde, it is H-CHO.
The chemical structure of these compounds is different. Both are organic compounds that contain carbon, hydrogen, and oxygen atoms. They have a carbonyl functional group, which is a CHO group. Formaldehyde is also a form of aldehyde, and aldehydes have a carbonyl group.
The carbonyl group attaches with another carbon from one side, and from the other end, it links up with a hydrogen atom. Formaldehyde forms organically in the atmosphere when oxygen, methane, and other hydrocarbons react together under the sunlight. Formaldehyde is beneficial in producing disinfectants, fertilizer, automobiles, paper, cosmetics, and wood preservation.