Answer:
Explanation:
Sugars are polyhydroxy aldehydes or polyhydroxy ketones. This means that have several -OH groups in all of their carbons. According to the disposition of these groups in the molecule (whether they are facing up or down), they constitute one sugar or a different one.
These molecules are called isomers, specifically diastereomers because they have an opposite configuration in some chiral centers but the same configuration in others.