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CBSE Class 11-science Answered

Why Ortho Nitrophenol has less boiling point than paranitrophenol?
Asked by | 03 Feb, 2012, 08:34: PM
answered-by-expert 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 | 04 Feb, 2012, 10:05: AM
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