What is the strongest noncovalent interaction that can occur between hydrocarbon is???

The strongest type of non covalent interaction is between two ionic groups of opposite charge that occur between hydrocarbon is London force.

Explanation:

London dispersion forces:  

Weakest inter-molecular forces   are the forces that cause non-polar substances to form solids when the temperature is lowered sufficiently.  Exist in molecules such as F , O , N   and even in mono-atomic molecules He, Ne, Ar, etc. The electron of a neutral molecule keeps on oscillating concerning nuclei of atoms. As a result of an instant, a positive charge may concentrate in one region and a negative charge in another region in the same molecule causing the 'self-polarization' of the molecule. This polarized molecule may induce a dipole moment in a neighboring molecule . The second atom can be distorted by the appearance of the dipole in the first atom or molecule resulting in the electrostatic attraction between 2 atoms or molecules.

Ithink it’s 3 as the answer.