Which Statement Best Describes the Structural Difference Between Aldehydes and Ketones

Which statement best describes the structural difference between aldehydes and ketones?

A) Aldehydes contain a hydroxyl group; ketones contain a carbonyl group.
B) Aldehydes contain a carbonyl group on an end carbon of the carbon chain; ketones contain a carbonyl group on a carbon within the carbon chain.
C) Ketones are cyclic compounds; aldehydes are acyclic compounds.
D) The carbonyl group of a ketone is bonded to an oxygen atom; the carbonyl group of an aldehyde is bonded to a hydrogen atom.
E) The carbonyl group of an aldehyde is bonded to two carbon atoms; the carbonyl group of a ketone is bonded to at least one hydrogen atom.

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