The reaction between an aldehyde and a primary amine to form an imine product is called imine formation. The balanced chemical equation for this reaction is:RCHO + HNR'2 RCH=NR' + H2OWhere R and R' are alkyl or aryl groups.The mechanism for this reaction involves the following steps:1. Nucleophilic attack: The nitrogen atom of the primary amine HNR'2 acts as a nucleophile and attacks the carbonyl carbon of the aldehyde RCHO . This results in the formation of a tetrahedral intermediate and the breaking of the carbonyl double bond C=O .2. Proton transfer: A proton H+ is transferred from the nitrogen atom of the tetrahedral intermediate to one of the oxygen atoms, forming an alcohol group -OH and a positively charged nitrogen atom NR'2H+ .3. Elimination of water: The alcohol group -OH acts as a leaving group and is eliminated as a water molecule H2O . This results in the formation of a double bond between the carbon and nitrogen atoms C=N , creating the imine product RCH=NR' .In summary, the mechanism for the reaction between an aldehyde and a primary amine to form an imine product involves nucleophilic attack, proton transfer, and elimination of water.