Butanone is a four-carbon compound with the functional group-

Correct option is B

The correct answer is (b) Ketone.
· Butanone (commonly known as methyl ethyl ketone) is a four-carbon compound that contains a ketone functional group (C=O) on the second carbon atom.
· A ketone is characterized by a carbonyl group (C=O) bonded to two carbon atoms. In the case of butanone, the carbonyl group is located between the second and third carbon atoms.
Information Booster:
· Carboxylic acid: Contains a –COOH functional group. Example: Ethanoic acid.
· Aldehyde: Contains a –CHO group, with the carbonyl group attached to at least one hydrogen. Example: Formaldehyde.
· Alcohol: Contains an –OH (hydroxyl) group. Example: Ethanol.