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Question
Dipole moment of phenol is smaller than that of methanol. Why?
Solution
In phenol, C – O bond is less polar due to electron-withdrawing effect of benzene ring, whereas in methanol C – O bond is more polar due to electron releasing effect of –CH3 group. Hence, the dipole moment of phenol (1.54 D) is smaller than that of methanol (1.71 D).
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