In the following reaction

Aldehydes and ketones can react with Grignard reagents to form alcohols. Grignard reagents are organometallic compounds containing a carbon-magnesium bond (R-Mg-X).

The reaction between ketone and a Grignard reagent involves the nucleophilic addition of the carbon atom of the Grignard reagent to the carbon-oxygen double bond of the ketone. This leads to the formation of a metal alkoxide intermediate. Subsequently, the metal alkoxide reacts with water (or a protic solvent) to yield the alcohol.