Which of the following is not an example of ideal solution?

Ethyl alcohol + Water

An ideal solution is one that follows Raoult's law over the entire range of composition and does not show any deviation in behavior from what is expected based on the ideal behavior of the components. In an ideal solution, the intermolecular forces between the molecules of different components are very similar to those between the molecules of the same component.The solution that is not an example of an ideal solution is:

(4) Ethyl alcohol + Water

Ethyl alcohol (ethanol) and water form a mixture that does not behave ideally. This is because ethanol and water have different types of intermolecular forces and molecular sizes, leading to deviations from Raoult's law at various compositions. Specifically, this solution exhibits positive deviation from Raoult's law when the concentration of ethanol is relatively high and negative deviation when the concentration of water is relatively high. This behavior is commonly observed in mixtures of ethanol and water, especially in the intermediate range of compositions.