Question

The strongest acid among the following is

• A. o-methoxy phenol
• B. p -methoxy phenol
• C. m-methoxy phenol
• D. phenol

Answer 1

Answer: (C)

m-methoxy phenol

Answer 2

$m$ -methoxy phenol is the strongest acid Methoxy group at meta position exerts only $-I$ effect. Due to this, it withdraws electrons from all the nuclear position of the benzene ring including the one holding the $O-H$ group consequently, electron density in the $O - H$ bond decreases Hence, m-methoxy phenol becomes more acidic than $o$ -and $p$ -methoxy phenol