Question

1. Using suitable structures, explain the difference between a ketopentose, an aldohexose and a ketohexose
2.Draw an amino acid and identify the functional groups present

Answer 1

1. KETOPENTOSE
The 2-ketopentoses is a monosachride which have ketone functional group and have two chiral centers; therefore, four different stereoisomers are possible. Exaple is D-Ribulose

2. KETOHEXOSE
A ketohexose is a monosaccharide having a ketone functional group in its structure. It is a six carbon sugar and hence is called as Hexose. A Hexose having ketone group is known as Ketohexose. Fructose is an example of ketohexose.

3. ALDOHEXOSE
An Aldohexose is a monosaccharide having an aldehyde group in its structure. It is a six carbon molecule and is called as a hexose. Hexose with an aldehyde group is called as Aldohexose. Example of an Aldohexose is Glucose.