Carbohydrates are polyhydroxy compounds of___________________?
Correct answer: D. Aldehydes and ketones
- A. Glucose
- B. Glyceraldehydes
- C. Oligosaccharides
- D. Aldehydes and ketones
Explanation
Carbohydrates are generally defined as polyhydroxy aldehydes or ketones, or compounds that yield them on hydrolysis. Glucose is only one carbohydrate, so choosing glucose confuses an example with the complete definition.
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About Classification of Organic Compounds
Organic compounds are classified by carbon skeleton into open-chain, branched-chain and cyclic compounds, including homocyclic and heterocyclic types. The classification also uses functional groups to distinguish hydrocarbons, halo compounds, alcohols, aldehydes, ketones, carboxylic acids and their derivatives, which is different from naming compounds by IUPAC rules.
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