Question

When one mole of lactose is hydrolysed, the hydrolysate contains

• A. $1.0$ mol Galactose $+ 1.0$ mol Glucose
• B. $1.0$ mol Glucose $+ 2.0$ mol Galactose
• C. $1.0$ mol Glucose $+ 1.0$ mol Fructose
• D. $2.0$ mol Glucose

Hint:

Lactose is also known as milk sugar and is made up of glucose and galactose.

Answer 1

The Correct Option is A

Step 1: Nature of lactose.
Lactose is a disaccharide composed of one glucose unit and one galactose unit.

Step 2: Hydrolysis of lactose.
On hydrolysis, the glycosidic bond in lactose breaks, releasing its constituent monosaccharides.

Step 3: Products formed.
The hydrolysis of one mole of lactose produces one mole of glucose and one mole of galactose.

Step 4: Conclusion.
Hence, the correct answer is $1.0$ mol Galactose $+ 1.0$ mol Glucose.