The boiling point of $C_{6} H_{6}, C H_{3} O H, C_{6} H_{5} N H_{2} a n d C_{6} H_{5} N O_{2} a r e 80^{o} C, 65^{o} C, 184^{o} C a n d 212^{o} C$ respectively. Which will show highest vapour pressure at room temperature:

C_{6} H_{6}

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C H_{3} O H

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C_{6} H_{5} N H_{2}

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C_{6} H_{5} N O_{2}

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Solution

The correct option is B $C H_{3} O H$
Vapour pressure : At a constant temperature, the pressure exerted by the vapours of a liquid on its surface when they (liquid and its vapours) are in equilibrium, is know as vapour pressure.
So compound with lower boiling point have higher vapour pressure.

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