Question

Why are aldehydes and ketones polar compounds?

Answer 1

Both aldehydes ($R-CHO$) and ketones($RCO{R}^{\prime }$) contain a $C=O$ bond. Oxygen is more electronegative than carbon draws the electron density towards it which creates a slight positive charge over the less electronegative carbon atom and negative charge over the more electronegative oxygen atom. This creates a net dipole moment pointing from carbon towards oxygen and thus makes the compound polar.