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Chemistry · 2026 · 2 marks
CBSE 2026 · Region 3 · Set 2 · Q21
How do you explain the following? (a) Presence of a carbonyl group in glucose (b) Presence of five - OH groups in glucose
How do you explain the following?
(a)
Presence of a carbonyl group in glucose
(b)
Presence of five - OH groups in glucose
Marking-scheme solution
(a)
On reaction with H2N-OH, glucose forms an oxime or with HCN glucose
forms cyanohydrin or chemical equation.
(b)
On reaction with (CH3CO) 2O, glucose forms stable pentaacetate. or
chemical equation
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CBSE Class 12 Chemistry past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.