
Concept explainers
Interpretation:
Sugar can be referred as polyhydroxy carbonyl compounds. This terminology must be explained.
Concept Introduction:
Polyhydroxy carbonyl compounds are those which contains more than one alcoholic -OH groups along with

Answer to Problem 28A
Carbohydrates have either aldehyde or ketone
Thus sugar can be termed as polyhydroxy carbonyl compounds.
Explanation of Solution
Sugar are two types which are aldoses and ketoses. Aldoses contain aldehyde group along with many hydroxyl groups. On the otherhand ketoses have ketone group along with many hydroxyl groups. Depending on number of carbon atoms there are many sugar like aldotriose (D-Glyceraldehyde), aldotetrose (D-Erythrose), aldopentose (D-Ribose) and aldohexose (D-Glucose). Similarly there are many ketoses depending on number of carbon atoms. One of the examples is D-Fructose which is a ketohexose.
Chapter 21 Solutions
World of Chemistry
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