Chapter 18, Problem 18.122EP

(a)

Interpretation Introduction

Interpretation: The validation of the fact that maltose gives a positive Benedict’s test has to be predicted.

Concept introduction: Monosaccharides and most of the disaccharides give positive test with Benedict’s solution.  It is used to detect the presence of aldehyde or alpha hydroxy ketones.  A positive test with Benedict’s solution is confirmed by the formation of a brick-red precipitate.

(b)

Interpretation Introduction

Interpretation: The validation of the fact that cellobiose gives a positive Benedict’s test has to be predicted.

Concept introduction: Monosaccharides and most of the disaccharides give positive test with Benedict’s solution.  It is used to detect the presence of aldehyde or alpha hydroxy ketones.  A positive test with Benedict’s solution is confirmed by the formation of a brick-red precipitate.

(c)

Interpretation Introduction

Interpretation: The validation of the fact that sucrose gives a positive Benedict’s test has to be predicted.

Concept introduction: Monosaccharides and most of the disaccharides give positive test with Benedict’s solution.  It is used to detect the presence of aldehyde or alpha hydroxy ketones.  A positive test with Benedict’s solution is confirmed by the formation of a brick-red precipitate.

(d)

Interpretation Introduction

Interpretation: The validation of the fact that lactose gives a positive Benedict’s test has to be predicted.

Concept introduction: Monosaccharides and most of the disaccharides give positive test with Benedict’s solution.  It is used to detect the presence of aldehyde or alpha hydroxy ketones.  A positive test with Benedict’s solution is confirmed by the formation of a brick-red precipitate.