Write the number of hydroxyl groups present in α–D–(+)–Glucopyranose (trans).

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Q. Write the number of hydroxyl groups present in α-D-(+)-Glucopyranose (trans).

Maharashtra MsbshseMaharashtra HSC (MSBSHSE) Board 2019Subjective· 1mImportance★★★★★

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The pyranose (cyclic, six-membered) form of glucose carries 5 free –OH groups: on C1 (anomeric), C2, C3, C4, and the primary –OH on C6.

In the open-chain form, glucose ( $C_6H_{12}O_6$ ) has –OH groups on C2, C3, C4, C5 and C6 (C1 is the aldehyde carbon, with no –OH). On cyclisation, the C5–OH attacks the C1 aldehyde carbon to form the six-membered pyranose ring (hemiacetal); C5's oxygen becomes the ring oxygen, but a new –OH (the anomeric hydroxyl) appears at C1. So the total count of free hydroxyl groups is unchanged: C1 (anomeric –OH, $\alpha$ or $\beta$ ), C2, C3, C4 …

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Q.Write the number of hydroxyl groups present in α–D–(+)–Glucopyranose (trans).

Concept understanding — Glucose Structure

Q.Write the number of hydroxyl groups present in α–D–(+)–Glucopyranose (trans).

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