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Dipole moment of phenol is smaller than ...

Dipole moment of phenol is smaller than that of methanol. Why ?

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O-H bond in phenol is less polar than the O-H bond in methanol, Infact, phenyl with -I effect decreases the electron density on the phenolic oxygen while group with +I effect increases the electron density on the oxygen atom of the of alcoholic group. As a result , the polarity of phenolic group is less than that of alcoholic group and so is the dipole moment value of phenol is less as comparfed to that of methano.
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