MHT CET 2026 Chemistry question

Which carbon atoms of glucose, numbered from 1 to 6 forms a hemiacetal structure between- CHO and - OH groups

(A)C-2
(B)C-3
(C)C-4
(D)C-5Correct

Answer: (D)

Solution

Open-chain glucose has the aldehyde group on C-1 and hydroxyl groups on C-2 to C-6. The OH on C-5 can attack the C-1 carbonyl carbon intramolecularly, closing a six-membered ring (five carbons plus one oxygen, the pyranose ring) and forming a cyclic hemiacetal; C-1

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Question ID VK-097751