(D) The ring structure of fructose is a hemiketal,not a hemiacetal. Fructose $(C_6H_{12}O_6)$ is a laevorotatory ketohexose. It acts as a reducing sug

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Its ring structure is hemiacetal.

(D) The ring structure of fructose is a hemiketal,not a hemiacetal. Fructose $(C_6H_{12}O_6)$ is a laevorotatory ketohexose. It acts as a reducing sugar due to the presence of an $\alpha$-hydroxy ketone group which can tautomerize to an aldehyde in basic solution.