Chapter 24, Problem 24.31P

Interpretation Introduction

(a)

Interpretation:

The products obtained from the reaction of lactobionic acid and $1M$ aqueous $\text{HCl}$ are to be stated.

Concept introduction:

The hydrolysis of the disaccharides is done in the presence of acid as a catalyst. The hydrolysis of the disaccharide is the breaking of the glycosidic linkage to give two monosaccharides units. Glycosidic linkage is an acetal linkage and acetal linkage hydrolysis takes place in the presence of an acidic solution.

Interpretation Introduction

(b)

Interpretation:

The products obtained from the reaction $(+)\text{-lactose}$ and dimethyl sulfate in presence of $\text{NaOH}$ are to be stated.

Concept introduction:

The methylation of the hydroxyl group of sugars is an important reaction. The methylation of hydroxyl groups is done with the help of methylating agent, dimethyl sulfate in the presence of strong base sodium hydroxide.

Interpretation Introduction

(c)

Interpretation:

The products obtained from the reaction product of part (b) and $1M$ aqueous ${\text{H}}_{\text{2}}{\text{SO}}_{\text{4}}$ are to be stated.

Concept introduction:

The hydrolysis of the disaccharides is done in the presence of acid as a catalyst. The hydrolysis of the disaccharide is the breaking of the glycosidic linkage to give two monosaccharides units. Glycosidic linkage is an acetal linkage and acetal linkage hydrolysis takes place in the presence of an acidic solution.