Alkanes only interact with each other via London Dispersion, also known as induced-dipole induced-dipole, forces. Since alkanes do not contain any atoms other than Carbon and Hydrogen, they are non-polar. However, as the electrons move freely about their orbital, some temporary polarity is formed.
These induced dipoles can interact with each other to create intermolecular bonding between non-polar alkanes. The more surface area the alkane has, the stronger these forces will be.
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