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Carbohydrates are best described as which of the following?

1. Polycarbonyl alcohols
2. Polycarboxylic aldehydes
3. Polyhydroxy carboxylic acids
4. Polyhydroxy aldehyde or ketone

Correct answer: Polyhydroxy aldehyde or ketone

Solution

Carbohydrates are polyhydroxy aldehydes (aldoses like glucose) or polyhydroxy ketones (ketoses like fructose), or compounds that yield these on hydrolysis. This is their standard chemical definition.

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