The number of -OH groups in open chain and ri | vedclass

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(B) In the open-chain structure of $D$-glucose $(CHO-(CHOH)_4-CH_2OH)$,there are $5$ hydroxyl $(-OH)$ groups.In the cyclic (ring) structure of $D$-glu

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$5, 5$

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(B) In the open-chain structure of $D$-glucose $(CHO-(CHOH)_4-CH_2OH)$,there are $5$ hydroxyl $(-OH)$ groups.In the cyclic (ring) structure of $D$-glucose (glucopyranose),one $-OH$ group is involved in the formation of the hemiacetal linkage,but it remains as an $-OH$ group (the anomeric hydroxyl group). Thus,there are still $5$ hydroxyl groups present in the ring structure.

The number of $-OH$ groups in open chain and ring structures of $D$-glucose are respectively:

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