The functional groups present in caffeine are alkene, amide, and amine.
ketone
The functional group of biphenyl is aromatic ring, benzene.
alkyl groups and amino group.
alkane haloalkane amide alcohol ketone not so much a functional group but it does contain ring structures like benzene
The amino functional group.
urea has a carbonyl functional group present in it i.e C=O
ketone
Propanone (a.k.a. acetone) contains a ketone as a functional group as well as alkane hydrocarbons.
The functional group of biphenyl is aromatic ring, benzene.
phosphate
alkyl groups and amino group.
Carbonyl group either ALDEHYDE or KETONE.
Aldehyde (functional group). The molecule responsible is cinnamaldehyde.
The functional group is the NH2. It is an amino functional group.
alkane haloalkane amide alcohol ketone not so much a functional group but it does contain ring structures like benzene
The amino functional group.
It is the amino functional group amine