Chloroform and acetone form a non-ideal solution in which A...B type interaction are more than A.. A and B...B type interaction due to H-bonding. Hence, the solution shows, negative deviation from Raoult's law, i.e., ΔVmix=−ve;ΔHmix=−ve∴ total volume of solution = less than (30 + 50 mL) or < 80 mL