A fatty acid contains primarily carbon and hydrogen atoms, and its hydrocarbon tail is very hydrophobic. What kind of interaction can occur between hydrocarbon tails of fatty acids?

Hydrophobic interaction.

Explanation:

On the basis of the polarity and the dissolution of water, the molecules can be classified into the hydrophilic and hydrophobic molecules. The hydrophobic molecules can easily dissolve in the non polar solvents.

The hydrophobic interaction is important that exist between the non polar molecules. The hydrophobic interaction plays an important role in the biological system as the lipids of the cell membrane are assisted together with the hydrophobic interaction. The hydrocarbon tail is non polar molecules that contains hydrophobic interaction within it.

Thus, the correct answer is hydrophobic interaction.