Concept:A volatile liquid evaporates easily, so it has a high vapour pressure and a low boiling point.
Explanation:Volatile liquids change readily into vapour at ordinary temperatures.
High volatility means more molecules escape into the vapour phase, giving a high vapour pressure.
Because they evaporate easily, they need less heat to boil, so their boiling point is low.
Therefore, the correct description is high vapour pressure and low boiling point.
Answer:A. high vapour pressure and low boiling point