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Question

The pair of boiling point and compound are given as,

C6H6, CH3OH C6H5NO2 C6H5NH2
80oC 65oC 212oC 184oC
(I) (II) (III) (IV)
Which will show lowest vapour pressure at room temperature?

A
C6H6
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B
CH3OH
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C
C6H5NO2
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D
C6H5NH2
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Solution

The correct option is C C6H5NO2
As the boiling point is inversely proportional to vapour pressure hence, nitrobenzene having bp 212oC will show the lowest vapour pressure at room temperature.

This is because low vapour pressure makes the substance more non-volatile and thus increase its boiling point.

Option C is correct.

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