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The hydroxyl group at which carbon is involved in ring formation in glucose?

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in Chemistry – Class 12 by (188k points)
The hydroxyl group at which carbon is involved in ring formation in glucose?

(a) C3

(b) C4

(c) C5

(d) C6

I had been asked this question in a job interview.

I'd like to ask this question from Biomolecules Carbohydrates in chapter Biomolecules of Chemistry – Class 12

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Right choice is (c) C5

The explanation: Monosaccharides undergo intramolecular reaction to form cyclic hemiacetal structures. Generally in aldoses, the C4 or C5 carbon is involved in cyclisation. In glucose, the hemiacetal (six-membered ring) is formed between the CHO group and  the OH group on the C5 carbon.

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