When cyclohexane is added to ethyl alcohol, which type of behaviour it will show from Raoult's Law?

positive deviation

The correct answer is Option 4: Positive deviation

Cyclohexane is a non-polar molecule, while ethyl alcohol is polar and shows strong hydrogen bonding between its molecules. When cyclohexane is added to ethyl alcohol, these hydrogen bonds are disrupted, and the interactions between cyclohexane and alcohol molecules are weaker than the original interactions in pure alcohol.

As a result, the vapour pressure of the solution increases more than expected, leading to a positive deviation from Raoult’s Law.