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What role does the molecular interaction...

What role does the molecular interaction play in a solution of alcohol and water ?

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There is strong intramolecular hydrogen bonding in alcohol molecules as well as water molecules separately. On mixing, intermolecular hydrogen bonding between alcohol and water molecules is comparatively weak. Hence, they show positive deviations from ideal behaviour. As a result, the solution will have higher vapour pressure and lower boiling point than that of water and alcohol.
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