Solutions Part 1

Acetonitrile (‌

δ+

CH3

−C≡‌

δ−

N

) and acetoneboth are polar molecules, hence
dipole-dipole interaction exist between them. Between KCl and water ion-dipole interaction is found and in Benzene ethanol, Benzene is non polar but ethanol is polar so it create dipole - induced dipole interaction Benzene -Carbon tetra chloride, both are non polar so one create instantaneous dipole and other gets induced by it.