Q.
Out of the compounds below the vapour pressure of (B ) at a particular temperature is
A) Higher than that of (A)
B) lower than that of (A)
C) Higher or lower than (A), depending on the size of the vessel
D) Same as that of (A)
Explanation
(a)
In ($A$) $para$-nitro phenol intermolecular (between two molecules) H-bonding exists while in ($B$) $ortho$ –nitrophenol, intramolecular H-bonding exists.
Because of the presence of intramolecular H-bonding, the boiling point of ($B$) is lower as compare to ($A$) and thus, ($B$) is more volatile $i.e$., has higher vapour pressure as compare to ($A$).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.