Which sugar contains a five-membered ring?

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(B) Sugars are classified based on the number of atoms in their ring structure.$1$. $A$ $5$-membered ring structure is known as a $Furanose$ ring,whic

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Furanose

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(B) Sugars are classified based on the number of atoms in their ring structure.$1$. $A$ $5$-membered ring structure is known as a $Furanose$ ring,which consists of $4$ carbon atoms and $1$ oxygen atom.$2$. $A$ $6$-membered ring structure is known as a $Pyranose$ ring,which consists of $5$ carbon atoms and $1$ oxygen atom.$3$. $Dextrorotatory$ and $Levorotatory$ are terms used to describe the optical rotation of light,not the ring size.Therefore,the correct option is $B$.

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