Question

Among the following mixtures, dipole-dipole as the major interaction, is present in?

• A. Benzene and carbon tetrachloride
• B. Benzene and ethanol
• C. Acetonitrile and acetone
• D. $KCl$ and water

Answer 1

The correct option is C Acetonitrile and acetone

Dipole-dipole force exist between polar molecules.
Option (a)
As all hydrocarbons are nonpolar so benzene $\left(C_6{H}_6\right)$ is non-polar and carbon tetrachloride is nonpolar because of symmetrical tetrahedral geometry. So, here london force are the major interaction.
Option (b)
As all hydrocarbons are non-polar so benzene $\left(C_6{H}_6\right)$ is nonpolar but ethanol $\left(C_2{H}_{5}OH\right)$ is polar. So here dipole-induce dipole force is the major interaction.
Option (c)
Acetonitrile $\left(C{H}_{3}CN\right)$ and acetone $\left(C{H}_{3}COC{H}_3\right)$ both are polar. So here dipole-dipole force is the major interaction.
Option (d)
$KCl$ is ionic copound while water is polar compound so here ion-dipole force is the major interaction.