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Lactose: Lactose is a disaccharide consisting of galactose and glucose. Since it contains glucose, it will test positive for glucose1.
Sucrose: Sucrose is another disaccharide, composed of fructose and glucose. It will also test positive for glucose1.
Glucose: Glucose itself is a monosaccharide and will obviously test positive for glucose.
The solutions containing lactose, sucrose, and glucose will all test positive for glucose. The other three solutions are not glucose-containing compounds and will not test positive for glucose.
