Final answer:
The four components of natural gas in order of increasing strength of intermolecular forces are propane, butane, 2-methylpropane, and n-pentane. The strength of intermolecular forces increases with increasing molecular mass.
Step-by-step explanation:
The four components of natural gas in order of increasing strength of intermolecular forces are propane, butane, 2-methylpropane, and n-pentane. Natural gas primarily consists of alkanes, which are nonpolar molecules, so the only important intermolecular force present is London dispersion forces. These forces increase with increasing molecular mass, so the strength of intermolecular forces increases as we move from propane to n-pentane.