Answer:
The \[\pi \]-electrons of the 
arc loosely held and
hence can be shifted towards O-atom more readily than the more tightly held \[\sigma
\]-electrons of the \[C-O\] bond in alcohols. Consequently, the magnitude of
the +ve and ?ve charge developed in bond is higher than those
on \[C-O\] bond of alcohols. As a result, the dipole moment of aldehydes and
ketones (2.3-2.8 D) is much higher than that of alcohols (1.6 - 1.8 D).
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