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what is the Pka value of ortho nitrophenol and paranitrophenol

what is the Pka value of ortho nitrophenol and paranitrophenol

Grade:11

1 Answers

Prateek
34 Points
8 years ago
In o-nitrophenol, there is intramolecular H-bonding b/w hydrogen and oxygen bcoz -NO2 group is very close to -OH group but in case of p-nirophenol there isno intramolecular H-bonding b/w hydrogen and oxygen bcoz -NO2 group is at opposite position  to -OH group.So, proton can easily be released from p-nitrophenol.That is why p-nitrophenol is more acidic than o-nitrophenol.  p-nitrophenol more acidic (pKa=7.1) than o-nitrophenol (pKa=7.2) even though the nitro group is both an ortho-para directing group(deactivating) and electron withdrawing,

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