JEE MainChemistryBiomolecules
Consider the following chemical transformations of D-glucose: I. D-glucose n-hexane II. D-glucose Gluconic acid III. D-glucose Saccharic acid The correct sequence of reagents required to carry out transformations I, II, and III respectively is:
Options
- AH ₂/ Pd , Br ₂ water, HNO ₃
- BHI / , HNO ₃ , Br ₂ water
- CHI / , Br ₂ water, HNO ₃
- DNaBH ₄ , HNO ₃ , Br ₂ water
Correct answer
C. HI / , Br ₂ water, HNO ₃
Step-by-step solution
Prolonged heating of D-glucose with HI reduces all oxygen-containing groups, yielding n-hexane. This corresponds to transformation I. Reaction of D-glucose with a mild oxidizing agent like Br ₂ water selectively oxidizes the aldehyde group to a carboxylic acid, yielding gluconic acid. This corresponds to transformation II. Reaction of D-glucose with a strong oxidizing agent like HNO ₃ oxidizes both the aldehyde and the primary alcohol groups to carboxylic acids, yielding the dicarboxylic acid, saccharic acid. This