MHTCET 18 Apr 2026 Shift 2 Paper

Concept:The physical state of an ether at room temperature depends on its boiling point.Explanation:Ethers have low boiling points because their molecules cannot form hydrogen bonds with each other.Among the given ethers, methoxyethane ($\mathrm{CH}_3\mathrm{OCH}_2\mathrm{CH}_3$) has the lowest molar mass.Therefore, it has the weakest intermolecular forces of attraction.Its boiling point is about $7.4^\circ\mathrm{C}$.Room temperature is approximately $25^\circ\mathrm{C}$.Since $25^\circ\mathrm{C} > 7.4^\circ\mathrm{C}$, the boiling point is below room temperature.Thus, methoxyethane exists as a gas at room temperature.The other ethers have higher molar masses and higher boiling points, so they remain liquids.For example, ethoxyethane ($\mathrm{C}_2\mathrm{H}_5\mathrm{O}\mathrm{C}_2\mathrm{H}_5$) boils at about $34.6^\circ\mathrm{C}$, which is above room temperature.Answer:Option C: Methoxyethane ($\mathrm{CH}_3\mathrm{OCH}_2\mathrm{CH}_3$)