Which glycosidic linkage between galactose and glucose is present in lactose?

How will you distinguish $1^o$ and $2^o$ hydroxyl groups present in glucose? Explain with reactions.

The $C_4$-epimer of glucose is:

Glycogen is a branched chain polymer of $\alpha-D$-glucose units in which the chain is formed by $C_1-C_4$ glycosidic linkage,whereas branching occurs by the formation of $C_1-C_6$ glycosidic linkage. The structure of glycogen is similar to:

What is the change in optical rotation with time in a freshly prepared sugar solution called?

$Glucose + \text{Tollen's reagent} o \text{Silver mirror}$ shows: