Question

If bolling point of ortho- nitro phenol and para nitro phenol are $t_1$ and $t_2$ respectively and mixture of these two are heated at tempreature 't' where 't' is between these two temprature. Vapours will significantly contains

• A. Ortho nitro phenol
• B. Para nitro phenol
• C. Both ortho and para nitro phenol
• D. None of these

Answer 1

Answer: (B)

Para nitro phenol

O-nitrophenol has intramolecular hydrogen bonding. P-nitrophenol has intermolecular hydrogen bonding. Intermolecular hydrogen bonding leads to a molecular association. This increases the boiling point. i.e O-nitrophenol has lower boiling point than P-nitrophenol. thus, when the mixture of these two are heated at temperature 't' where 't' is between these two temperatures. Vapours will significantly contain $\text{para nitro phenol.}$

Option B is correct.