Chapter 15.7, Problem 15.18P

(a)

Interpretation Introduction

Interpretation:

Given the each set of sugar molecule whether it is a hemiacetal (or) hemiketal it should be identified and anomeric carbon should be indicating on appropriate place.

Concept Introduction:

Ketal: A functional group bearing two alkyl group and two alkoxy groups are bonded to central carbon atom, it produced in the acid-catalysed alcoholysis (or) a hemiacetal.

Hemiketals: A compound with both an alcohol (-OH) groups and an ether (-OR) groups are bonded to the carbon atom that was at one time the ketone carbonyl carbon.

Anomer: This is a hemiacetal or acetal carbon in a cyclic saccharide an atom called the anomeric carbon. In other words two stereoisomers formed from the two possible sterocenters at the anomeric centre are called anomers.

(b)

Interpretation Introduction

Interpretation:

Given the each set of sugar molecule whether it is a hemiacetal (or) hemiketal it should be identified and anomeric carbon should be indicating on appropriate place.

Concept Introduction:

Acetal: An acetal is one of organic molecule where two separate oxygen atoms are single bonded to a central carbon atom it is called acetal. In other words compound that has two ether groups $\left(-OR\right)$ are bonded to the same carbon atom.

Hemiacetal: A compound with both an alcohol like $\left(-OH\right)$ group and ether like $\left(-OR\right)$ group bond to the carbon atom was at one time the aldehyde carbonyl carbon.

Anomer: This is a hemiacetal or acetal carbon in a cyclic saccharide an atom called the anomeric carbon. In other words two stereoisomers formed from the two possible sterocenters at the anomeric centre are called anomers.