• Molecular weight: 56.11 g/mol

• Colorless gas

• Petroleum like odor

• Boiling point: -7.0 °C

• Melting point: -140.7 °C

• Density: 0.589 g/cm³ at 25 °C (when pressure > 1 atm

• Easily flammable and ignitable

• Produces hazardous decomposition products when burned- ex: carbon oxides 

• Highly reactive-used in polymerization reactions

Fun Fact:

Isobutylene is often found in polymers. Polymers are large molecules made of repeating units of smaller molecules.