Question

In polar molecular solids, the molecules are held together by ________

• A. dipole-dipole interactions
• B. dispersion forces
• C. hydrogen bonds
• D. covalent bonds

Answer 1

The correct option is A dipole-dipole interactions

The molecules in such solids are held together by relatively stronger dipole-dipole interactions. These solids are soft and non-conductors of electricity.
Their melting points are higher than those of non polar molecular solids yet most of these are gases or liquids under room temperature and pressure.
Example :
Dipole-Dipole interactions in $HCl$