Question

The boiling point of $C_6{H}_6,C{H}_{3}OH,C_6{H}_{5}N{H}_2$ and $C_6{H}_{5}N{O}_2$ are ${80}^{\circ },{65}^{\circ },{184}^{\circ }$ and ${212}^{\circ }$ respectively. Which will show highest vapourr pressure at room temperature?

• A. $C_6{H}_6$
• B. $C{H}_{3}OH$
• C. $C_6{H}_{5}N{H}_2$
• D. $C_6{H}_{5}N{O}_2$

Answer 1

The correct option is B $C{H}_{3}OH$

Boiling point is the temperature at which the vapor pressure of a liquid become equal to atmospheric pressure.

$\to$ So, the compounds which has low boiling point will have high vapor pressure.

$\to$ Given ${CH}_{3}OH$ has boiling point of ${65}^0$.

$\to$ It has highest vapor among given with $0.166$ atm.

Ans :- Option B.