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

Explanation

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.