Which of the following functional group of carbon does NOT contain oxygen?
Answer & explanation
Correct answer: option 2
The correct answer is option 2. Halogen.
The functional group of carbon that does NOT contain oxygen is Halogen.
Halogen functional groups involve the attachment of a halogen atom (such as fluorine, chlorine, bromine, or iodine) to a carbon atom. Unlike the other options listed (alcohol, aldehyde, and ketone), halogen functional groups do not contain oxygen atoms. They are characterized by the presence of a carbon-halogen bond.