What property of acetylene makes it particularly hazardous?

Acetylene is particularly hazardous due to its highly explosive nature when mixed with air in certain proportions. This property stems from acetylene's wide flammability range, which allows it to ignite and explode when conditions are right. The combination of acetylene with oxygen results in a mixture that can lead to extremely intense and rapid combustion, making it critical for safety measures to be in place during its use in torch operations.

The other properties listed, while they may pose risks in different contexts, do not define acetylene's primary hazard in the same way that its explosive nature does. For example, while acetylene does generate toxic fumes upon combustion, the immediate danger in industrial or operational settings typically revolves around its explosive potential. Similarly, while it can be corrosive or cause frostbite, these characteristics aren't what primarily dictate the safety practices surrounding its handling and storage during torch operations.