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What functional groups are there in caffeine?
The functional groups in caffeine are amine and amide.
The structure of caffeine is
Let's look first at the 5-membered ring.
The two N atoms are part of amine groups.
The ##"C=C"## and ##"C=N"## bonds look like functional groups, but they are neither alkene nor imine groups.
They are both part of the 5-membered system called an imidazole ring.
An imidazole ring is aromatic, like benzene.
Now let's look at the 6-membered ring.
The C=O and N groups look like ketone and amine groups, but they are not.
A C=O next to an N is an amide group.
There are two amide groups in the ring.
So caffeine contains two amine and two amide functional groups.