Answer: \(CH_3OCH_3\) and \(C_2H_5OH\)
Explanation: The compounds having similar molecular formula but different arrangement of atoms or groups in space are called isomers and the phenomenon is called as isomerism.
\(CH_3OCH_3\) and \(C_2H_5OH\) are functional isomers which have same molecular formula but different functional groups attached.
(1) \(NO_2\) and \(N_2O_4\) are different compounds.
(2) \(P_2O_5\) and \(P_4O_{10}\) are different compounds.
(3) \(HCOOH\) and \(CH_3COOH\) are different compounds.
