The representative unit in a molecular compound is a molecule.

Here's why:

* Molecular compounds are formed by the sharing of electrons between nonmetal atoms.

* Molecules are the smallest unit of a molecular compound that retains the chemical properties of that compound.

For example, water (H₂O) is a molecular compound. A single water molecule, consisting of two hydrogen atoms bonded to one oxygen atom, represents the smallest unit of water that exhibits the properties of water.