Answer
a) Ketone.
b) Aldehyde.
c) Carboxylic acid.
d) Amine
Work Step by Step
Ketone group $-CO-$
Aldehyde group $ -CHO$
Carboxylic acid group $-COOH$
Amine (secondary) group $-NH-$
Now, we can easily identify those groups, if present, in a compound.
See below figure. Functional groups are marked out with dotted circle.
a) Ketone.
b) Aldehyde.
c) Carboxylic acid.
d) Amine (secondary amine to be specific).
