Question

For the two compounds, the vapour pressure of (2) at a particular temperature is expected to be:-

• A. Higher than (i)
• B. Lower than that of (i)
• C. Same as that of (i)
• D. Can be 'higher or lower depending upon the size of the vessel

Answer 1

Answer: (A)

Higher than (i)

(2) has intramolecular Hydrogen bonding. Due to this, there is less association between the molecules and hence, higher vapour pressure.

(1) has intermolecular hydrogen bonding , leading to more association between the molecules. Due to this, (1) has low vapour pressure than (2).