Question

Which of the following exists as a liquid at room temperature due to the formation of associated molecules only?

• A. Benzene
• B. Ammonia
• C. Bromine
• D. Carbon disulphide

Answer 1

The correct option is A Benzene

Benzene is a non-polar aromatic molecule. Benzene has a melting point of ${5.5}^{0}C$ and a boiling point of ${80}^{0}C$. It is therefore liquid at room temperature.

${NH}_3$ liquid boils at ${-33.3}^{0}C$ and freezes at ${-77.3}^{0}C$ to white crystals. So at room temperature is gas.

Bromine evaporates readily to form coloured gas at room temperature.

Carbon disulphide evaporates at room temperature.

Hence, the correct answer is option $\text{A}$.