Answer: Amine does not contain an oxygen atom
Explanation:
amine is represented by -NH2
amide is represented by -CONH2
aldehyde is represented by -CHO
ketone is represented by -CO
ether is represented by -CO
ester is a represented by -COOR
alcohol is represented by -OH
carboxylic acid is represented by -COOH
You will observe that the only functional group without an oxygen atom is amine with -NH2