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The strongest acid among the following is:
- o-methoxyphenol
- phenol
- m-methoxyphenol
- p-methoxyphenol
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Solution
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m-Methoxy phenol is the strongest acid.
Methoxy group at meta position exerts an 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 phenols.
Option B is correct.
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