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Chemistry · 2026 · 2 marks
CBSE 2026 · Region 3 · Set 3 · Q20
How do you explain the following? (a) Presence of an aldehyde group in glucose (b) Presence of a primary alcoholic group in glucose
How do you explain the following ?
(a)
Presence of an aldehyde group in glucose
(b)
Presence of a primary alcoholic group in glucose
Marking-scheme solution
(a)
Glucose on reaction with mild oxidising agent like Br2 water gives six
carbon carboxylic acid (gluconic acid) or chemical equation.
(b)
Glucose on reaction with conc.HNO3 gives saccharic acid 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.