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(D) The reaction of $HC \equiv C-CH_2-CH_2-COCH_3$ with $HgSO_4$ and dilute $H_2SO_4$ is a hydration reaction of an alkyne. The terminal alkyne underg

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$CH_3COCH_2CH_2COCH_3$,$3$-methylcyclopent-$2$-en-$1$-one

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(D) The reaction of $HC \equiv C-CH_2-CH_2-COCH_3$ with $HgSO_4$ and dilute $H_2SO_4$ is a hydration reaction of an alkyne. The terminal alkyne undergoes hydration to form a ketone. The product $A$ is $CH_3COCH_2CH_2COCH_3$ (hexane-$2,5$-dione).Next,the reaction of $CH_3COCH_2CH_2COCH_3$ with $EtONa$ and $EtOH$ is an intramolecular aldol condensation. The base $EtO^-$ abstracts an $\alpha$-hydrogen from one of the methyl groups,forming an enolate,which then attacks the other carbonyl group to form a five-membered ring. Subsequent dehydration yields $3$-methylcyclopent-$2$-en-$1$-one as product $B$.

The products $A$ and $B$ of the below reaction sequence are

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