Chapter 18, Problem 18.123EP

(a)

Interpretation Introduction

Interpretation: The number of acetal and hemiacetal carbon atoms in the given disaccharide has to be predicted.

Concept introduction: If an $-\text{OH}$ group and an $-\text{OR}$ group are attached to the same carbon atom, then the compound is known as a hemiacetal.  If two $-\text{OR}$ groups are attached to the same carbon atom, then the compound is known as an acetal.

(b)

Interpretation Introduction

Interpretation: The number of acetal and hemiacetal carbon atoms in the given disaccharide has to be predicted.

Concept introduction: If an $-\text{OH}$ group and an $-\text{OR}$ group are attached to the same carbon atom, then the compound is known as a hemiacetal.  If two $-\text{OR}$ groups are attached to the same carbon atom, then the compound is known as an acetal.

(c)

Interpretation Introduction

Interpretation: The number of acetal and hemiacetal carbon atoms in the given disaccharide has to be predicted.

Concept introduction: If an $-\text{OH}$ group and an $-\text{OR}$ group are attached to the same carbon atom, then the compound is known as a hemiacetal.  If two $-\text{OR}$ groups are attached to the same carbon atom, then the compound is known as an acetal.

(d)

Interpretation Introduction

Interpretation: The number of acetal and hemiacetal carbon atoms in the given disaccharide has to be predicted.

Concept introduction: If an $-\text{OH}$ group and an $-\text{OR}$ group are attached to the same carbon atom, then the compound is known as a hemiacetal.  If two $-\text{OR}$ groups are attached to the same carbon atom, then the compound is known as an acetal.