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Among the following which one is more acidic-1.p-nitrophenol 2.p-hydroxy benzoic acid 3.o-hydroxy benzoic acid 4.p-toluic acid

Posted by Shivangi Yadav 5 years ago

Entrance Exam > JEE main > Chemistry

1 answers

Gaurav Seth 5 years ago

Among the following compounds, the most acidic is: [JEE-2011]

a)

p - nitrophenol
b)

p - hydroxybenzoic acid
c)

o - hydroxybenzoic acid
d)

p - toluic acid

Correct answer is option 'C'.

Ortho-isomer, a strong hydrogen bridge can be formed between the phenolic -OH and the the carboxylate anion. This will tend to stabilize the conjugated carboxylate base, and hence will increase acidity.

this is the order of acidic

ortho hydroxy B.acid > meta hydroxy B.acid > benzoic acid > para hydroxy B. acids.

ANSWER

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