Which of the following is least acidic p-nitrophenol o-nitrophenol M-Nitrophenol o Methylphenol?

Although o-nitrophenol should be more acidic than p-nitrophenol, but due to intramolecular H-bonding it is less acidic. ii. There is only -I effect of (NO2) group at m-position, so (b) is less acidic than (I) (-R and -I at para).

Why para nitrophenol is most acidic?

The decrease in electron density of the O – H bond of p-nitrophenol, the polarity of O – H bond decreases. The electron withdrawing group (-NO ), withdraws electrons and disperses the negative charge. Therefore, -NO group stabilizes the phenoxide ion. Hence p-nitrophenol is more acidic than phenol.

Which is more acidic p-nitrophenol?

p-nitrophenol. o-nitrophenol. m-nitrophenol. Thus, ortho and para-nitrophenols are more acidic than m-nitrophenol is a little less acidic than p-nitrophenol because of intramolecular hydrogen bonding which makes the loss of a proton difficult to remove.

Why and how p-nitrophenol is stronger acid than its other family members?

Nitro group of phenol produces -I and -R effect. So, the electron density in the O-H bond of p-nitrophenol decreases relative to the O-H bond of phenol. The decrease in electron density of the O-H bond of p-nitrophenol, the polarity of O-H bond is decreases and in turn make it more acidic than phenol.

What is the acidic order of O nitro phenol M nitro phenol & P nitro phenol & Why?

The acidic nature of the three nitrophenols increases in the order: meta < ortho < para. Para-nitorophenol is the most acidic among the three. The nitro group attached to a conjugated system shows strong -M effect, and this decreases the electron density more at the ortho and para positions than at the meta position.

Which of the following is least acidic p-nitrophenol?

Among o- and nitrophenols, o- nitrophenol is little less acidic than p-nitrophenol due to intramolecular H-bonding which makes the loss of a proton little more difficult.

Which is more acidic P methoxyphenol or phenol?

It increases electron density on the benzene ring and does not delocalize negative charge of phenoxide ion. It decreases acidity. So, now we should know that p−methoxyphenol is less acidic than phenol.

How can we separate o-nitrophenol and p-nitrophenol?

A mixture of o-nitrophenol and p-nitrophenol can be separated by steam distillation.

Which is more acidic M nitrophenol or o-nitrophenol?

Thus, o – and p – nitrophenols are more acidic than m – nitrophenol. Among o- and p nitrophenols, o- nitrophenol is little less acidic than p-nitrophenol due to intramolecular H-bonding which makes loss of a proton little more difficult.

Which is more acidic o-nitrophenol or phenol?

Ortho nitro phenol is more acidic , because -R and -I effect and steric effect helps in release of proton more easily as compare to meta position .

Why o-nitrophenol is stronger acid than phenol?

The presence of this group in the ortho or para position decreases the electron density in the O? H bond. As a result, it is easier to lose a proton. Hence, ortho and para nitrophenols are stronger acids than phenol.