Which item is flammable?

• A. Gasoline
• B. Bleach
• C. Liquid hand soap
• D. Antifreeze

Answer: (A)

Flammability hinges on whether a substance can form ignitable vapors that catch fire in air. Gasoline does this very readily: it releases vapors that mix with air and can ignite from a spark or flame even at room temperature, so it burns easily and is considered flammable. Bleach isn’t a fuel; it’s an oxidizer and, while dangerous and reactive with organics, it doesn’t burn to sustain a flame. Liquid hand soap is mainly water and mild organic compounds with a high flash point, so it won’t ignite under normal conditions. Antifreeze contains glycol and water; it can burn only at higher temperatures and is not readily ignitable in everyday use, so it isn’t flammable like gasoline.