Match the reagent in List I with the product obtained from D-glucose in List II. List I: (P) HI with red P, heat; (Q) HCN; (R) bromine water; (S) conc. HNO3. List II: (1) n-hexane; (2) cyanohydrin; (3) gluconic acid; (4) saccharic acid.

AP-2, Q-1, R-4, S-3
BP-1, Q-2, R-3, S-4
CP-1, Q-2, R-4, S-3
DP-3, Q-2, R-1, S-4

Answer: B

HI reduces all oxygen functions to give n-hexane (unbranched six-carbon chain); HCN adds to the carbonyl to give a cyanohydrin; Br2 water oxidises only CHO to gluconic acid; conc. HNO3 oxidises both CHO and CH2OH to saccharic acid. So P-1, Q-2, R-3, S-4.

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