Answer
The functional groups in Capsaicin are:
• ether
• alcohol
• aromatic
• amide
• alkene
Work Step by Step
1. The benzene ring is the aromatic functional group.
2. The $-OCH_3$ on the benzene ring is the ether.
3. $-OH$ group on the benzene ring is the alcohol functional group. (Technically it is called a phenol )
4. The $NCO$ group is the amide functional group.
5. The double bond at the end is the alkene functional group.