Question

Which of the following is not an ideal solution?

• A. Benzene + Toluene
• B. Methyl alcohol + Ethyl alcohol
• C. Chloroform + Acetone
• D. Carbon tetrachloride + Silicon tetrachloride

Hint:

Hydrogen bonding or strong intermolecular interactions cause deviations from ideality.

Answer 1

The Correct Option is C

Step 1: Recall ideal solution definition.
An ideal solution obeys Raoult’s law at all concentrations and temperatures, with no enthalpy or volume change on mixing.
Step 2: Analyze options.
(A) Benzene + Toluene: Nearly ideal, similar structure.
(B) Methyl alcohol + Ethyl alcohol: Nearly ideal, similar polarities.
(C) Chloroform + Acetone: Not ideal — due to strong hydrogen bonding between chloroform (–H) and acetone (C=O), leading to negative deviation.
(D) CCl$_4$ + SiCl$_4$: Non-polar molecules, nearly ideal.
Step 3: Conclusion.
Thus, the solution of Chloroform + Acetone is not ideal.