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Question: Answered & Verified by Expert
Molecular formula of pentahydroxy acid obtained when glucose is oxidised with $\mathrm{Br}_2$ water is
ChemistryBiomoleculesJEE Main
Options:
  • A $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_7$
  • B $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_8$
  • C $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6$
  • D $\mathrm{C}_6 \mathrm{H}_{10} \mathrm{O}_6$
Solution:
1000 Upvotes Verified Answer
The correct answer is: $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_7$
Glucose on oxidation with bromine water yields gluconic acid $(\mathrm{C} 6 \mathrm{H} 12 \mathrm{O} 7)$. This reaction confirms the presence of an aldehyde group. Because for the formation of gluconic acid, free aldehyde group must be present.

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