Carbon tetrachloride, CCL4, is nonpolar.

What force holds the molecules together?

Covalent bonds between C and Cl (note it isn't a capital L but Cl). Although the molecule as a whole is non-polar, each C-Cl bond is slightly polar because the electronegativity of C is 2.5 and that of Cl is 3.0. The bonding, however, is largely shared electrons with a covalent bond.

The force that holds the molecules of carbon tetrachloride (CCl4) together is known as London dispersion forces or van der Waals forces. These forces arise due to temporary fluctuations in the electron distribution around the atoms, resulting in the formation of temporary dipoles. These temporary dipoles induce corresponding dipoles in neighboring molecules, creating a weak attraction between them. In the case of carbon tetrachloride, the symmetrical arrangement of the four chlorine atoms around the central carbon atom cancels out any permanent dipole moment, making it a nonpolar molecule. Therefore, London dispersion forces are the primary force holding CCl4 molecules together.

The force that holds the molecules of carbon tetrachloride (CCl4) together is known as London dispersion forces, also called van der Waals forces. London dispersion forces occur between all molecules, regardless of whether they are polar or nonpolar. However, they are the only type of intermolecular force acting between nonpolar molecules like CCl4.

London dispersion forces arise due to temporary fluctuations in electron distribution within molecules, creating temporary dipoles. These temporary dipoles induce complementary temporary dipoles in neighboring molecules, resulting in an attractive force between them. Although individual London dispersion forces are relatively weak, in substances with many molecules, the cumulative effect can be significant enough to hold the substance together.

CCl4 is nonpolar because the chlorine atoms surrounding the central carbon atom are positioned symmetrically, resulting in a balanced distribution of electron density. Since there is no permanent dipole moment in CCl4, the only intermolecular force acting between its molecules is London dispersion forces.