Q.

A→q,s; B→p,r; C→q,s; D→p,rHexane and heptane; chlorobenzene and bromobenzene are the mixtures that form ideal solutions, i.e. they follow Raoult's law in all conditions of T and p.For such solutions.                         ΔHmix =0 and ΔVmix=0Mixture of chloroform with acetone and water with nitric acid show negative deviation from Raoult's law. So for these pairs.              A−B>A−A or B−B interaction ΔVmix <0 and ΔHmix <0