Question

Which of the following has lowest boiling point ?
(a) p-Nitrophenol
(b) m-Nitrophenol
(c) o-Nitrophenol
(d) Phenol

Answer 1

Option C is the right answer

hope it helpfull
❤️❤️❤️❤️❤️

Answer 2

Answer:

o-Nitrophenol has lowest boiling point than p-Nitrophenol, m-Nitrophenol and Phenol.

Explanation:

• The boiling point of a compound depends upon the force of attraction between different atoms of the complex.
• Intramolecular Hydrogen bonding forms within the same molecule results in the cyclization of the molecule and prevents the association of the molecule. Intramolecular Hydrogen bonding causes strong intramolecular forces.
• Intermolecular Hydrogen bond forms between the Hydrogen atom of one molecule and electronegative element of other molecule.
• P-NITROPHENOL has intermolecular nitrogen bonding as the nitro group is far from alcohol group and has highest boiling point.
• M-NITROPHENOL has intermolecular Hydrogen bonding and associated with another molecule. So, it has highest melting point.
• O-Nitrophenol has intramolecular Hydrogen bond and undergoes cyclization of molecule. Hence it is highly volatile and boiling point is lower than others.
• Phenol also have intramolecular Hydrogen bonding and higher boiling point than O-Nitrophenol.