What type of organic compound contains the following functional group?

A carbonyl group, which is a carbon atom double-bonded to an oxygen atom, bonded to a carbon atom and a hydrogen atom.

Answer

Aldehyde

Amino acid

Carboxylic acid

Ether

I believe the correct answer from the choices listed above is the third option. The functional group that is being described here would be a carboxylic acid. any of a class of organic compounds in which a carbon (C) atom is bonded to an oxygen (O) atom by a double bond and to a hydroxyl group (-OH) by a single bond.