Why Ortho nitrophenol has lower boiling point than p-nitrophenol?

P-nitrophenol shows intermolecular hydrogen bonding. So it has higher bonding point. Whereas o-nitrophenol shows intra molecular H-bonding hence lower boiling point.

Why does p-nitrophenol have higher melting point than O-nitrophenol?

In p-nitrophenol, molecular association takes place due to extensive hydrogen bonding between the molecules (intermolecular hydrogen bonding). Therefore, it has higher melting and boiling points. In o-nitrophenol, since the OH and NO2 are in close proximity to each other, intramolecular hydrogen bonding takes place.

What is the difference between ortho nitrophenol and para nitrophenol?

The key difference between ortho nitrophenol and para nitrophenol is that ortho nitrophenol consists of a -OH group and a -NO2 group at 1st and 2nd positions of the ring structure, whereas para nitrophenol consists of a -OH group and a -NO2 group attached to the 1st and 4th positions of the ring structure.

What is the boiling point of para nitrophenol?

534.2°F (279°C)
4-Nitrophenol/Boiling point

Why Ortho nitrophenol has lower boiling point than meta and para isomer?

Hence just in case of o-nitrophenol, thanks to intramolecular H-bonding it acts as a monomer whereas for para isomers thanks to intermolecular H-bonding it’s ready to keep company with other molecules and acts as polymer-like. Hence, O-nitrophenol contains a lower boiling point than P-nitrophenol.

What is the boiling point of phenol?

359.1°F (181.7°C)
Phenol/Boiling point

Which of the following have higher melting point and why P nitro phenol and o nitro phenol?

p-nitrophenol has a higher molecular weight than o-nitrophenol.

Why is Ortho nitrophenol more acidic than ortho methoxy phenol?

The nitro-group is an electron-withdrawing group. On the other hand, methoxy group is an electron-releasing group. Thus, it increases the electron density in the O-H bond and hence, the proton cannot be given out easily. For this reason, ortho-nitrophenol is more acidic than ortho-methoxyphenol.

Which is more acidic ortho or para?

Ortho nitrophenol is less acidic than para nitrophenol because of the intermolecular hydrogen bonding which makes the loss of proton very difficult. So, para nitrophenol is more acidic.

Which is more polar ortho or para nitrophenol?

o-Nitrophenol will have lesser dipole moment than p-nitrophenol. This is because of resonance. During resonance, OH group will be electron donating group and will carry positive charge, where as nitro group is electron withdrawing group and carries negative charge.

Which of the following has lowest boiling point?

The chemical element with the lowest boiling point is Helium and the element with the highest boiling point is Tungsten. The unity used for the melting point is Celsius (C).