A pentose is a monosaccharide with five carbon molecules. Pentoses are sorted out into two gatherings. Aldopentoses have an aldehyde useful gathering at position 1. Ketopentoses have a ketone useful gathering in position 2 or 3.
The aldopentoses have three chiral focuses and in this way eight diverse (2^3) stereoisomers are conceivable.
The 2-ketopentoses have two chiral centers, and therefore four different
stereoisomers are possible (2^2). The 3-ketopentoses are rare.
Aldopentoses
The aldopentoses have three chiral focuses and in this way eight diverse (2^3) stereoisomers are conceivable. Ketopentoses
The 2-ketopentoses have two chiral centers, and therefore four different
stereoisomers are possible (2^2). The 3-ketopentoses are rare. 
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