WAEC Chemistry 2017 Paper

Concept:Condensation of two glucose units forms a disaccharide by eliminating a water molecule.Explanation:Two molecules of glucose ($C_6H_{12}O_6$) join together through a condensation reaction.One water molecule ($H_2O$) is removed during this bond formation.The resulting disaccharide has the formula $C_{12}H_{22}O_{11}$.This disaccharide is specifically maltose, not sucrose, galactose, or mannose.Galactose and mannose are monosaccharides, not disaccharides.Sucrose is made from glucose and fructose, not two glucose units.Answer:B. Maltose