Question

Which of the following is liquid at room temperature?

• A. Ethanol
• B. Methane
• C. Ethane
• D. Ethyne

Hint:

Ethanol is a common liquid fuel and solvent, while methane, ethane, and ethyne are gases under normal conditions.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
At room temperature (around 25$^\circ$C), the physical state of substances depends on their boiling points.
Ethanol: Boiling point $\approx$ 78$^\circ$C, so it exists as a liquid at room temperature.
Methane, Ethane, Ethyne: Have very low boiling points (below 0$^\circ$C), so they exist as gases at room temperature.
Step 2: Detailed Explanation:
Among the given options, only ethanol remains liquid under normal conditions.
Step 3: Final Answer:
The liquid at room temperature is Ethanol.