Why Ortho Nitrophenol has less boiling point than paranitrophenol?

Asked by  | 3rd Feb, 2012, 08:34: PM

Expert Answer:

p-nitro phenol, is capable of forming intermolecular hydrogen bonding between, while o-nitrophenol forms intramolecular H-bond.

There is significant 
change in the molecular weight of substances when intermolecular hydrogen bonds are formed. This in turn, increases its boiling point as well.
 
In p-nitrophenol, as there are intermolecular hydrogen bonding, it increases the molecular weight, whereby increasing the boiling point. So o-nitrophenol has less boiling point compared to p-nitrophenol.

Answered by  | 4th Feb, 2012, 10:05: AM

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