Dimethyl ether is an ether with the formula \(CH_3-O-CH_3\).
Ethers have the general formula R-O-R', where R and R' are alkyl groups.
(1) \(CH_3-CO-CH_3 \)is propanone (acetone), a ketone.
(2) \(CH_3-O-CH_3 \)is dimethyl ether, an ether.
(3) It's unclear what structure this is (likely a ester derivative or incorrect form).
(4) Acetic Acid derivative or incorrect form.
Therefore, the correct answer is (2).
IUPAC name of the given ether is:
Better results for the preparation of ethers X and Y can be obtained from reactant pairs respectively