Aldehydes containing at least one -hydrogen atom undergo a reaction in presence of dilute aq. NaOH to form -hydroxyl aldehyde. Identify the reaction.

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Aldehydes containing at least one -hydrogen atom undergo self-addition in the presence of a dilute base like aqueous NaOH to form -hydroxy aldehydes. This reaction is known as the Aldol reaction. For example, two molecules of ethanal react in the presence of dilute NaOH to form 3-hydroxybutanal (an aldol). Cannizzaro reaction is given by aldehydes lacking -hydrogen atoms. Reformatsky reaction involves the reaction of an -halo ester with a carbonyl compound in the presence of zinc. Wolff-Kishner reaction is the redu