When a monosaccharide forms a cyclic hemiacetal,the carbon atom that is part of the hemiacetal is a new chirality center,called the anomeric carbon.

Question

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When a monosaccharide forms a cyclic hemiacetal, the carbon atom that was part of the carbonyl group (either aldehyde or ketone) in the open-chain form becomes a new chiral center as it is attached to four different groups, including the oxygen atom from the hydroxyl group that attacks the carbonyl carbon. This carbon is known as the anomeric carbon.

When a Monosaccharide Forms a Cyclic Hemiacetal,the Carbon Atom That