Three alcohols - ethanol, propanol and butanol are mixed and heated for a long time in a beaker. Which is the last one to evaporate?

Ethanol

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Propanol

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Butanol

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All evaporate at the same time

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Solution

The correct option is C Butanol
Ethanol - $C_{2} H_{5} O H$
Propanol - $C_{3} H_{7} O H$
Butanol - $C_{4} H_{9} O H$
The three alcohols form a homologous series. Molecular mass increases in any homologous series due to which a gradation of physical properties occurs. Boiling point is a physical property and so it increases in a homologous series. So the last one to evaporate will be butanol .

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