The functional group present in an aldehyde is
Correct answer: B. a carbonyl group at the end of the chain, written CHO
- A. a hydroxyl group
- B. a carbonyl group at the end of the chain, written CHO
- C. a carboxyl group
- D. a carbonyl group between two carbon atoms
Explanation
In an aldehyde the carbonyl carbon carries at least one hydrogen and so must be terminal, whereas in a ketone the same carbonyl group lies between two carbon atoms. This structural difference is why aldehydes are readily oxidised to carboxylic acids and give a positive test with Tollens reagent while ketones do not. The carboxyl group of an acid combines a carbonyl and a hydroxyl on the same carbon.
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About Functional Groups
Functional groups are specific atoms or atom groups that determine the characteristic reactions and properties of organic compounds. Coverage includes alkenes, alkynes, halo, hydroxyl, ether, carbonyl, carboxyl, ester, amino and nitro groups, together with their structures, nomenclature and related homologous series.
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