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Answer -
In pure alcohol and water, themolecules are held tightly by a strong hydrogen bonding. The interactionbetween the molecules of alcohol and water is weaker than alcoholтИТalcohol andwaterтИТwater interactions. As a result, when alcohol and water are mixed, theintermolecular interactions become weaker and the molecules can easily escape.This increases the vapour pressure of the solution, which in turn lowers theboiling point of the resulting solution.