Which of the following shows negative deviation from Raoult's law ?

Explanation

(i) Let the consider a solution of phenol and aniline. Both phenol and aniline form hydrogen bonding interactions amongest thermelves.
(ii) When mixed with aniline, the phenol molecule forms hydrogen bonding interactions with aniline, which are stronger than the hydrogen bonds formed amongst themselves.
(iii) Formation of new hydrogen bonds considerably reduce the esacping tendency of phenol and aniline from the solution.
(iv) As a result, the vapour pressure of the solution is less and there is a slight decrease in volume `(Delta V_("mixing") lt 0)` on mixing.
(v) During this process evolution of heat takes place i.e., `Delta H_("mixing")lt 0` (exothermic).

(vii) Example: Acetone + Chloroform, Chloroform + Diethyl ether