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Chapter 8: Q23P (page 345)

Explain why the pka of p-nitrophenol is 7.14, whereas the pka of m-nitrophenol is 8.39.

Short Answer

Expert verified

p-nitophenol is more acidic than m-nitrophenol that is why pka of p-nitrophenol is less (7.14) as compared to the pka of m-nitrophenol(8.39).

Step by step solution

01

What is strong acid?

The compound which can release H+ ion in aqueous solution or in the presence of a base is known as a strong acid or the compound whose conjugate base is weak (stable) is also a strong acid.

Lesser the value of pka more will be its acidity.

02

Explanation

Firstly we will take conjugate base of both the compounds.

pka value for p-nitrophenol is less than the pka value for m-nitrophenol because p-nitrophenol is more acidic than m-nitrophenol as there is more conjugation in the structure of p-nitrophenol (stable compound) as compared to m-nitrophenol in which conjugation is less(less stable).

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