Question

which one contain aldehyde functional group
(1) Ethanol
(2) Ethanoic acid
(3)Ethanal
(4) Propanone​

Answer 1

Answer:

Aldehydes and ketones are organic compounds which incorporate a carbonyl functional group, C=O. The carbon atom of this group has two remaining bonds that may be occupied by hydrogen or alkyl or aryl substituents. If at least one of these substituents is hydrogen, the compound is an aldehyde.

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Answer 2

(3 Ethanal................................