Which characteristic is a property of molecular substances?

The given question is incomplete as the options are not provided. The correct options for this questions are as follows-

(1) Good heat conductivity

(2) Good electrical conductivity

(3) Low melting point

(4) High melting point

Thus, the question now is solved below as:

Option (3)

Explanation:

Molecular substances are simply defined as those substances that are comprised of more than two atoms and are interlinked with one another. These atoms are linked with each other by the weaker intermolecular forces. This weak bond reflects the low and high melting point of the substance.  

These molecular substances differ from the molecular compounds because, in the case of molecular compounds, the atoms are linked with one another by a strong covalent bond.

Thus, the correct answer is option (3).

double the distance = divide strength by 4