The dipole-dipole interaction energy between stationary polar molecules and rotating polar molecules,respectively,is proportional to: [$r$ is the distance between the polar molecules]

Intermolecular forces are forces of attraction and repulsion between interacting particles that will include :
$A$. dipole-dipole forces $B$. dipole-induced dipole forces $C$. hydrogen bonding $D$. covalent bonding $E$. dispersion forces
Choose the most appropriate answer from the options given below :

Which one of the following substances consists of small discrete molecules?

The melting point of $AlF_3$ is $1040 \, ^{\circ}C$ and that of $SiF_4$ is $-77 \, ^{\circ}C$ (it sublimes) because

Which of the following is an example of instantaneous dipole-induced dipole attraction?

$A$ solid melts at a temperature above $100\,^oC$ and is a non-conductor of electricity in both solid and molten states. It is soluble in hydrocarbon solvents. What is the most likely structure of the solid?