The end of the hydrocarbon chain ending with ketone is the suffix A. All B. Al C. One D. Oik

The correct answer is D. Oik.

A ketone is a type of organic compound that contains a carbonyl group (C=O) bonded to two alkyl groups. The suffix “-one” is used to name ketones. For example, the compound CH3COCH3 is called propanone, which is also known as acetone.

The other options are incorrect. Option A, “all”, is not a suffix used to name ketones. Option B, “al”, is a suffix used to name alkanes. Option C, “one”, is a suffix used to name alkenes.