2-chloro-2-methylpropane, ball and stick molecular model. This is one of the five isomers of C4H9Cl with a boiling point of 50 degrees Celsius. The more spherical the molecule the lower the boiling point. 2-chloro-2-methylpropane is a colourless liquid organic compound. Black balls are carbon atoms, white balls are hydrogen atoms and the green ball is a chlorine atom.