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When a base is present, theaddition of waterto analdehydecauses the following reaction:Thehydroxide ionfunctions as a nucleophile in the first phase of the mechanism by being able to donate a single pair of electrons to the carbon atom of thecarbonyl bond.Upon addition, analkoxideis created. Water then protonates thealkoxide,regenerating a hydroxide ion and a primary gem-diol. When two neighboring alkyl groups are linked to a carbon atom, the result is a secondarygem-diol.This would result from the substrate molecule was ketone. When an alcohol and analdehydecombine to generate a new compound, ahemiacetalis created. This compound has a carbon atom attached to both an ether andhydroxyl group. A carbon atom that is joined to two ether groups and comes from analdehyde-reacting species is known as an acetal group.Learn more aboutAldehydehere-brainly.com/question/17101347#SPJ4...