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Aldose - The carbonyl group (aldehyde) is at the end of the carbon chain

Ketose - carbonyl group is at the end of the chain

D- Glucose aldohexose

D-Fructose a ketose
Rules for naming by carbon number and carbonyl type
Carbonyl type + Carbon amount = new name.
ex. Ketose + pentose = Ketopentose
Names of sugar based on number of carbons
triose 4.tetrose 5. pentose 6. hexose 7. heptose