Number of -OH groups in a sugar or nucleoside

This type of question, asked 3 times: 12 May 2024 S2, 14 May 2024 S1, 23 Apr 2025 S1. All 3 questions below, oldest first.

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Question 1
12 May 2024 S2
95 $What is the number of -OH groups present in one molecule of ribose?$
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Question 2
14 May 2024 S1
74 $In which of the following carbohydrate, molecular mass increases 84 u after complete acetylation?$
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Question 3
23 Apr 2025 S1
67 $What is the total number of -OH groups present in ribonucleoside?$
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