MHT CET 2022 Chemistry question

Which carbon atoms of fructose are bonded together through oxygen forming fructofuranose?

(A)2 and 5Correct
(B)1 and 6
(C)1 and 5
(D)2 and 6

Answer: (A)

Solution

Fructose is a ketohexose with the keto group at C-2. In the cyclic form the C-5 hydroxyl group adds to the C-2 carbonyl, forming a hemiketal with an oxygen bridge between C-2 and C-5. This gives a five-membered ring (four carbons + one oxygen),

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Question ID VK-093673