Fischer projection formula has to be drawn for the ball-and-stick model of the monosaccharide given and also it has to be labelled as D or L sugar. Concept Introduction: Fischer projection formula simply uses cross for representing tetrahedral carbon atom. The carbon atom that is present in the intersection point in cross. The horizontal bonds means they are coming forward and they are present on wedge bond. The vertical bonds means they are pointing away and they are present on dashed lines. A carbon atom that is bonded to four different groups is known as a chiral carbon atom. This can rotate the plane polarized light. D- and L- isomers of monosaccharide can be identified by looking into the chiral center that is farther from the carbonyl group. In a Fischer projection, if the OH group is present on the right side in the chiral center that is farthest from the carbonyl group means it is a D monosaccharide and if the OH group is present on the left side means it is a L monosaccharide.

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Chapter 14, Problem 14.35AP

a.

Interpretation Introduction

Interpretation:

Fischer projection formula has to be drawn for the ball-and-stick model of the monosaccharide given and also it has to be labelled as D or L sugar.

Concept Introduction:

Fischer projection formula simply uses cross for representing tetrahedral carbon atom. The carbon atom that is present in the intersection point in cross. The horizontal bonds means they are coming forward and they are present on wedge bond. The vertical bonds means they are pointing away and they are present on dashed lines.

A carbon atom that is bonded to four different groups is known as a chiral carbon atom. This can rotate the plane polarized light. D- and L- isomers of monosaccharide can be identified by looking into the chiral center that is farther from the carbonyl group. In a Fischer projection, if the OH group is present on the right side in the chiral center that is farthest from the carbonyl group means it is a D monosaccharide and if the OH group is present on the left side means it is a L monosaccharide.

b.

Interpretation Introduction

Interpretation:

Given monosaccharide has to be classified based on the number of carbon atoms present in the chain and also the carbonyl group.

Concept Introduction:

Simplest carbohydrates are known as monosaccharides. They contain three to six carbons generally in a chain form with a carbonyl group present in the terminal or the adjacent carbon atom from the terminal. Monosaccharides that have the carbonyl group at the terminal carbon atom C1 are known as aldoses and the monosaccharides that have the carbonyl group on the adjacent carbon atom C2 are known as ketoses.

The number of carbon atoms present in the chain characterize the monosaccharide. They are given below.

Carbon chain with three carbon atoms is triose.

Carbon chain with four carbon atoms is tetrose.

Carbon chain with five carbon atoms is as pentose.

Carbon chain with six carbon atoms is as hexose.

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