Aldoses vs. Ketoses

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Monosaccharides are either aldehyde or ketone derivatives of straight chain polyhydroxy alcohols containing at least three carbon atoms.

Structure difference an aldehyde and a ketone

First, let’s revisit the difference between an aldehyde and a ketone:


If the carbonyl group of a sugar is an aldehyde, the sugar is called an aldose. If the carbonyl group of a sugar is a ketone, the sugar is called a ketose.

An example of an aldose:


An example of a ketose:


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