Answer:
The compounds are called aldehydes.
Explanation:
Let us understand the structure of given class of compounds
a) aldehydes : These are carbonyl compounds that contain a carbonyl group bonded to a carbon atom and a hydrogen atom. (structure I)
b) amines: these groups do not have any carbonyl group. They have -NH₂ group. (Structure II)
c) Amino acids : they have a carboxylic group and and an amine group attached to one common carbon.(Structure III)
d) Alcohol : they have one hydroxyl group attached to carbon.(Structure IV).