William G. answered 06/03/24
PhD Org Chemist with 15+ Years of College Teaching Experience
The final answer would be "D". You start out with an enamine which has the properties of an enolate nucleophile to accept the acetyl chloride electrophile. This has the net effect of an alpha acetylation. Following an aqueous acid work up, you restore the cyclopentanone and it has the beta-carbonyl (1,3-diketone). The next step is a sodium borohydride reduction of the 1,3-diketone and you end up with a 1,3-diol.