Which from following pairs of carbohydrates contains galactose in both of them as one of the constituent ?

Step-by-step solution

Lactose is a disaccharide which on hydrolysis yields one molecule of D-galactose and one molecule of D-glucose. Raffinose is a trisaccharide which on hydrolysis yields one molecule each of D-galactose, D-glucose, and D-fructose. Sucrose is a disaccharide yielding D-glucose and D-fructose on hydrolysis. Maltose is a disaccharide yielding two molecules of D-glucose on hydrolysis. Thus, both lactose and raffinose contain galactose as one of their constituent monosaccharides. Answer: Lactose and Raffinose