Here's why:
* Carbonyl group: A carbonyl group consists of a carbon atom double-bonded to an oxygen atom (C=O).
* Aldehyde: An aldehyde is an organic compound containing a carbonyl group where the carbon atom is also bonded to at least one hydrogen atom. This means the carbonyl group is located at the end of a carbon chain.
Example:
* Ethanal (acetaldehyde): CH3-CHO. The "CHO" at the end of the molecule represents the carbonyl group (C=O) bonded to a hydrogen atom, making it an aldehyde.
In contrast:
* Ketones: Ketones also contain carbonyl groups, but the carbonyl carbon is bonded to two other carbon atoms, meaning it's located within the carbon chain, not at the end.
In summary: The location of the carbonyl group determines whether a molecule is an aldehyde or a ketone. Aldehydes have the carbonyl group at the end of the molecule, while ketones have it within the carbon chain.
