Question

Draw the Fischer projection for the D-2-ketotetrose. Switch between an aldose and a ketose by clicking on \"switch carbonyl group.\" Add or delete carbon atoms using the add (\" \") or delete (\"x\") buttons. Clicking on a blue box once adds a hydrogen atom (H). Clicking on a blue box again toggles between H and OH.

Answer 1

Concepts and reason

The structure of a ketotetrose needs to be drawn. The name denotes that the molecule belongs to carbohydrate family. Hence, draw the structure by considering the rules for drawing a carbohydrate.

Fundamentals

To deduce the structure of carbohydrate, follow the steps given below:

• Determine the group that the carbohydrate belongs to from the name like monosaccharides (consists of one unit), disaccharides (two units of monosaccharides), or oligosaccharides (3-8 units of monosaccharides).

For example: aldotriose is a monosaccharide, maltose is a disaccharide which gives two molecules of glucose on hydrolysis and so on.

• Draw the chain containing total number of carbons from the given number. For example: triose represent a 3-carbon chain and so on.

• Deduce whether the molecule is an aldehyde or ketone. For example: aldo represent an aldehyde and keto represent a ketone to get the complete structure.

• The D and L nomenclature configuration decides the position of the OH group bonded to the last chiral carbon.

The given molecule is a monosaccharide.

The molecular formula of the given molecule is ${{\rm{C}}_4}{{\rm{H}}_8}{{\rm{O}}_4}$

The structure of the D-2-ketotetrose is as follows:

Ans:

The structure of the D-2-ketotetrose is as follows: