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MODEL PAPER 2025 — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryMODEL PAPER 20251 Mark
Question
Assertion $(A)$ : Glucose does not form the hydrogensulphite addition product with $\ce{NaHSO_3}$ .
Reason $(R)$ : Glucose exists in a six $-$ membered cyclic structure called pyranose structure
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Answer

 Both $A$ and $R$ are true but $R$ is not the correct explanation of $A$.
Due to the absence of a free aldehydic group, it does not give a reaction with $\ce{NaHSO_3}.$

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