Kinds of Organic Reactions Addition reactions Occur when two reactants add together to form a single product with no atoms“left over'” Reaction of fumarate with water to yield malate (a step in the citric acid cycle of food metabolism) H 0 HO H These two ...give this reactants... 0 H20 one product. H H 01 Fumarate Malate n Leaming All Rights Reserved Addition reactions ▪ Occur when two reactants add together to form a single product with no atoms “left over” ▪ Reaction of fumarate with water to yield malate (a step in the citric acid cycle of food metabolism) Kinds of Organic Reactions