Answer
The functional groups in thyroxine are:
• alcohol
• aromatic
• ether
• aryl iodide
• amine
• carboxylic acid
Work Step by Step
1. The -OH group on the benzene is the alcohol functional group.
2. The benzene ring is the aromatic functional group.
3. The -O- atom between the two benzene rings is part of the ether functional group.
4. The iodides attached to the benzene rings are aryl iodides.
5. The $-CHNH_2$ group is the amine functional group.
6. The $-COOH $ is the carboxylic acid functional group.
