From its structure, we can see that vanillin does not have a ketone functional group, but it has an aldehyde. It also has a phenol and ether functional group. For that reason, I wouldn't categorize is as just an aldehyde.
The functional group of citral is the aldehyde (alkanal) group. It has the structure -CHO
Carbonyl
Aldehyde
The functional group of biphenyl is aromatic ring, benzene.
Carbonyl
Carbonyl
From its structure, we can see that vanillin does not have a ketone functional group, but it has an aldehyde. It also has a phenol and ether functional group. For that reason, I wouldn't categorize is as just an aldehyde.
The functional group of citral is the aldehyde (alkanal) group. It has the structure -CHO
Carbonyl
They have the same functional group.
aldehyde
Carbonyl
An amino aldehyde is an organic compound containing both an amino and an aliphatic aldehyde functional group.
a formyl group
Aldehyde and ketones .
Aldehyde