Question:

Given below are two statements :
Statement I : o-Nitrophenol is steam volatile due to intramolecular hydrogen bonding.
Statement II : o-Nitrophenol has high melting due to hydrogen bonding.
In the light of the above statements, choose the most appropriate answer from the options given below :

Show Hint

Intramolecular H-bonding makes o-nitrophenol steam volatile and keeps its melting point low; intermolecular H-bonding raises melting point (as in p-nitrophenol).
Updated On: Nov 4, 2026
  • Both Statement I and Statement II are true
  • Statement I is true but Statement II is false
  • Statement I is false but Statement II is true
  • Both Statement I and Statement II are false
Show Solution
collegedunia
Verified By Collegedunia

The Correct Option is B

Solution and Explanation

Statement I: in o-nitrophenol the OH and \(\mathrm{NO_2}\) groups are adjacent, so there is intramolecular (chelation) hydrogen bonding. Molecules are not associated with each other, so o-nitrophenol is steam volatile. TRUE.
Statement II: because the H-bonding is intramolecular and not intermolecular, there is no molecular association, and o-nitrophenol has a low melting point (318 K) compared with p-nitrophenol (387 K), which has intermolecular H-bonding. So Statement II is FALSE.
Answer: (2) Statement I is true but Statement II is false
Was this answer helpful?
0
0