Both sucrose and lactose are disaccharides. Sucrose on hydrolysis gives one molecules each of glucose and fructose, but lactose on hydrolysis gives one molecules each of glucose and galactose.
`underset("Sucrose")(C_(12)H_(22)O_(11))+H_(2)Ooverset(H_(3)O^(+))underset("or Invertase")(rarr) underset("D-(+)-Glucose D-(-)-Fructose")(C_(6)H_(12)O_(6)+C_(6)H_(12)O_(6))`
`underset("Lactose")(C_(12)H_(22)O_(11))+H_(2)Ooverset(H_(3)O^(+))underset("or Lactase")(rarr) underset("D-(+)-Glucose D-(-)-Galactose")(C_(6)H_(12)O_(6)+C_(6)H_(12)O_(6))`