Ans. Aldehydes and ketones can undergo nucleophilic addition reactions with various nucleophiles. The nucleophile attacks the electrophilic carbon of the carbonyl group, leading to the formation of a new bond and the creation of an intermediate. This intermediate can then undergo further reactions, such as protonation or elimination, to yield different products. The nucleophilic addition reactions of aldehydes and ketones are important in organic synthesis, as they allow the introduction of new functional groups and the formation of more complex molecules.