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Q.

Which substance has the highest vapour pressure at  25∘C ?

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a

 1-butanol, CH3CH2CH2CH2OH

b

 Methanol, CH3OH

c

 1-propanol, CH3CH2CH2OH

d

 Ethanol, CH3CH2OH

answer is A.

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Detailed Solution

Due to its molecules being smaller than those of ethanol and having lower intermolecular forces than ethanol, methanol has a higher vapor pressure.

Weaker the I.M.F, higher the V.P. (MeOH has lowest M.W.)

Hence, the correct option is A.

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