Two alkyl groups are derived from butane. CH 3 CH 2 CH 2 CH 2 CH 2 CH 3. Ethane-CH 2 CH 3.
Hexane-CH 2 CH 2 CH 2 CH 2 CH 2 CH 3.
Thus alkyl groups are derived from alkanes. IUPAC ketone functional group names contain oxo or keto. Acetone is a ketone. Alkyl halides haloalkanes consist of an alkyl group attached to a halogen.