Which of the following is a characteristic of butylene?

Butylene is characterized as highly flammable due to its chemical properties as a hydrocarbon. It belongs to the alkene family and is known to easily ignite and burn in the presence of an ignition source. This flammability is a significant safety concern in emergency response situations, as it poses a risk of fire and explosion if not managed properly.

While butylene is indeed a gas at temperatures above its boiling point, which could potentially make it a correct choice, the emphasis on its flammability is particularly vital in emergency situations, especially when considering the need for quick identification of hazardous materials. Additionally, although it may be odorless and colorless, not all hydrocarbon gases share these characteristics uniformly. Understanding the inherent flammability of butylene is crucial for individuals trained to respond to chemical emergencies, as this knowledge can significantly affect safety protocols and response strategies.