MHT CET 2026 Chemistry question

Which carbon atom (numbered from 1' to 5') of ribose lacks the oxygen to form deoxyribose ?

(A)5’
(B)3’
(C)2’Correct
(D)1’

Answer: (C)

Solution

Ribose (in RNA) is a pentose with OH groups on C-2', C-3' and C-5' (C-1' carries the base link). In 2'-deoxyribose (the sugar of DNA) the hydroxyl group on C-2' is replaced by H, so the carbon that lacks oxygen is 2',

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Question ID VK-100125