Carbonyl functional group contain molecule H-C-OH. Hence, option D is correct.
What is a functional group?
A functional group is a group of atoms responsible for the reactions of a particular compound.
A carbonyl group contains a double bond linking a carbonyl carbon atom and a carbonyl oxygen atom. The carbonyl oxygen atom shares six valence electrons with the carbonyl carbon atom.
Hence, the carbonyl functional group contain the molecule H-C-OH.
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