Which of the following compounds has the molecular formula C2H6O?
Correct: C
Let's check the molecular formulas for each option: A) Methanol is CH3OH, which is C1H4O. B) Ethanoic acid is CH3COOH, which is C2H4O2. C) Ethanol is CH3CH2OH, which is C2H6O. D) Diethyl ether is CH3CH2OCH2CH3, which is C4H10O. Therefore, ethanol is the correct compound. (Note: Dimethyl ether also has the formula C2H6O, making it an isomer of ethanol, but ethanol is typically the primary example taught at this level among the given choices.)