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Can carbohydrates contain both aldehydes and ketones?

Can carbohydrates contain both aldehydes and ketones?

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Ans. No, Carbohydrates can not contain both aldehydes and ketones.

Explaination: Carbohydrates are polyhydroxy aldehydes or ketones. In a carbohydrate molecule, there are many hydroxyl groups(-OH) and either aldehyde (-CHO) or ketone (-CO-) as functional group. Hence, carbohydrates are classified as aldose when aldehyde group is present as functional group and ketose when ketone group is present in the Carbohydrate molecule. For, example, between the two hexose isomers i.e. glucose and fructose, glucose is aldose due to the presence of aldehyde group whereas fructose is ketose due to the presence of ketone group.

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