The intermolecular force of attraction is the weakest in state of matter. (Gaseous/Liquid)

Three types of potential energy due to attractive interaction between two species $\mathrm{X}$ and $\mathrm{Y}$ are represented by the curves $\mathrm{I}, \mathrm{II},$ and $\mathrm{III}$ in the figure below.

 
Consider the dominating interaction between non-rotating species $(\mathrm{X}\dots \mathrm{Y})$ for $\mathrm{X}={\mathrm{Na}}^{+},{\left({\mathrm{CH}}_3\right)}_2\mathrm{CO}$, ${\mathrm{C}}_6{\mathrm{H}}_6,{\mathrm{CH}}_4$ and $\mathrm{Y}={\left({\mathrm{CH}}_3\right)}_2\mathrm{CO},{\mathrm{Cl}}^{-},{\mathrm{C}}_2{\mathrm{H}}_6,{\mathrm{CHCl}}_3$. The correct assignment of the $\mathrm{X}$... $\mathrm{Y}$ interactions

to the types $\mathrm{I},\mathrm{II}$, and $\mathrm{III}$ is:

In which of the following solid substance dispersion forces exist?

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:

Match the type of interaction in column $\mathrm{A}$ with the distance dependence of their interaction energy in column $\mathrm{B}:$

Increasing order of boiling points in the following compounds is:

$\underset{\left(\mathrm{i}\right)}{{\mathrm{CH}}_3\mathrm{COOH}} \underset{\left(\mathrm{ii}\right)}{ {\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CHO}} \underset{\left(\mathrm{iii}\right)}{{\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{OH}} \underset{\left(\mathrm{iv}\right)}{{\mathrm{CH}}_3{\mathrm{COCH}}_3}$