Question
Write the products obtained after hydrolysis of lactose.
✓
Answer
Lactose is composed of $\beta-\text{D}$ galactose and $\beta-\text{D}$ glucose. Thus, on hydrolysis, it gives $\beta-\text{D}$ galactose and $\beta-\text{D}$ glucose.
$\text{C}_{12}\text{H}_{22}\text{O}_{11}\ \ \ +\ \ \ \text{H}_2\text{O}\ \ \ \xrightarrow{\ \ \ \ \ \ \ \ \ }\ \ \ \text{C}_6\text{H}_{12}\text{O}_6\ \ \ \ \ +\ \ \ \ \text{C}_6\text{H}_{12}\text{O}_6\\ \ \ \text{Lactose}\ \ \ \ \ \ \ \ \ \ \ \ \text{Water}\ \ \ \ \ \ \ \ \ \ \ \ \ \text{D}-\text{Glucose}\ \ \ \ \ \ \ \ \text{D}-\text{Galactose}$
$\text{C}_{12}\text{H}_{22}\text{O}_{11}\ \ \ +\ \ \ \text{H}_2\text{O}\ \ \ \xrightarrow{\ \ \ \ \ \ \ \ \ }\ \ \ \text{C}_6\text{H}_{12}\text{O}_6\ \ \ \ \ +\ \ \ \ \text{C}_6\text{H}_{12}\text{O}_6\\ \ \ \text{Lactose}\ \ \ \ \ \ \ \ \ \ \ \ \text{Water}\ \ \ \ \ \ \ \ \ \ \ \ \ \text{D}-\text{Glucose}\ \ \ \ \ \ \ \ \text{D}-\text{Galactose}$
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