Increasing order of acid strength among p-methoxy phenol, p - methyl phenol and p - nitro phenol is:

p - methyl phenol < p - methoxy phenol < p - nitro phenol

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p - methoxy phenol < p - methyl phenol < p - nitro phenol

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p - nitro phenol < p - methoxy phenol < p - methyl phenol

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p - nitro phenol < p - methyl phenol < p - methoxy phenol

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Solution

The correct option is A p - methyl phenol < p - methoxy phenol < p - nitro phenol
Increasing acid strength:

Acidic strength $α - R, - H, - I$
Acidic strength $α \frac{1}{+ R, + H, + I}$
where
R = Resonance effect
H = Hyperconjugation effect
I = Inductive effect
$- N O_{2}$ shows $- R_{1} - I$
$- O C H_{3}$ shows $+ R_{1} - I$
$- C H_{3}$ shows $+ H_{1} + I$

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