Question

D-Fructose is the sweetest monosaccharide. How does the Fischer projection of D-fructose differ from that of D-glucose? Match the words in the left column to the appropriate blanks in the sentences on the right. Fill in the blanks.

a ketone
carbon 3
carbon 2
carbon 1
an aldehyde
carbon 4
In D-glucose, there is__________ functional group, and the carbonyl group is at___________ when looking at the Fischer projection.
In D-tructose. there is functional group, and the carbonyl group is at when looking at______ the Fischer projection.

Answer 1

D-glucose has an aldehyde group at carbon 1, while D-fructose has a ketone group at carbon 2 in the Fischer projection. D-glucose has the OH groups to the right, except for carbon 3, and D-fructose shares the same OH group orientation from carbon 3 to carbon 6.

Step-by-step explanation:

In D-glucose, there is an aldehyde functional group, and the carbonyl group is at carbon 1 when looking at the Fischer projection. In contrast, in D-fructose, there is a ketone functional group, and the carbonyl group is at carbon 2 when looking at the Fischer projection. The other significant difference is that all the OH groups in D-glucose, except for the one on carbon 3, are on the right side in the Fischer projection. D-Fructose shares a similar orientation for the OH groups from carbon 3 to carbon 6 like D-glucose.

Answer 2

aldehyde

carbon-1

ketone

carbon-2

Step-by-step explanation:

Monosaccharides are colorless crystalline solids that are very soluble in water. Moat have a swwet taste. D-Fructose is the sweetest monosaccharide.

In the open chain form, monosaaccharides have a carbonuyl group in one of their chains. If the carbonyl group is in the form of an aldehyde group, the monosaccharide is an aldose; if the carbonyl group is in the form of a ketone group, the monosaccharide is known as a ketose. glucose is an aldose while fructose is a ketose.

In D-glucose, there is an aldehyde functional group, and the carbonyl group is at carbon-1 when looking at the Fischer projection.

In D-fructose, there is a ketone functional group, and the carbonyl group is at carbon-2 when looking at the Fischer projection.