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Whic of the following has greterg acidic strength p-hydroxy benzoic acid or p-methoxy benzoic acid?

Whic of the following has greterg acidic strength p-hydroxy benzoic acid or p-methoxy benzoic acid?

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1 Answers

Arun
25750 Points
5 years ago
-OH group has two effects, namely +R and -I effect i.e. Resonance and Inductive effect. When -OH group is attached to the para position, it has a tendency to delocalize it's electrons towards the aromatic ring (that is, benzene). Thus the electron density on oxygen atoms of carboxylic group increases and the polarity between O and H decreases leading to less acidity. Whereas when the -OH group is attached to the meta position, +R effect is not applicable and only -I effect is effective. Thus it withdraws the electrons from the ring, and increasing the polarity between O and H in carboxylic group, making it more acidic.

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