Ketones

A ketone is a functional group with the general formula R-CO-R', where R and R' are alkyl or aryl groups. The simplest ketone would have the smallest possible alkyl groups, which are methyl groups

Thus, the simplest ketone is acetone (propanone), with the structural formula .

(1) is dimethyl ether (an ether)
(2) is methylamine (an amine)
(3) is propanone (acetone), the simplest ketone
(4) (corrected to CH3-CO-OH here) would be acetic acid, but in the way its written doesn't work

Thus, the correct option is (3). Final Answer: The final answer is