During transfer operations, ethyl chloride spills into the water. According to the Chemical Data Guide, at what temperature will the ethyl chloride boil off the water?

Correct Answer: Option B — above 54°F

Ethyl chloride has a boiling point of 54°F (12.3°C). When spilled into water above this temperature, it rapidly flashes off into the atmosphere, creating a heavy, highly flammable vapor cloud requiring immediate area evacuation and hazard containment.