MHT CET 2025 Chemistry question

What is the total number of -OH groups present in ribonucleoside?

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

Answer: (C)

Solution

A ribonucleoside consists of D-ribose (a pentose) joined through the C-1' carbon by an N-glycosidic bond to a nitrogenous base (the anomeric OH of ribose is lost in this bond). Ribose has -OH groups on C-2', C-3' and C-5' (C-4' is part of the furanose ring

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Question ID VK-102538