NEET (UG) 2024 — Question 71

Glucose contains an aldehyde group. It reduces Tollen's reagent ($\ce{Ag(NH3)2+}$) to give a silver mirror. It adds HCN to form a cyanohydrin. It reacts with $\ce{NH2OH}$ (hydroxylamine) to form an oxime. Glucose does not give Schiff's test because the aldehyde is involved in cyclic hemiacetal formation. It does not form a bisulfite addition product with $\ce{NaHSO3}$ for the same reason. Thus, the reagents with which glucose does NOT react are B (Schiff's reagent) and E ($\ce{NaHSO3}$). Hence, the correct option is C (B and E).