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Glucose on prolonged heating with HI gives:

1. n-Hexane
2. 1-Hexene
3. Hexanoic acid
4. 6-Iodohexanal

Correct answer: n-Hexane

Solution

On prolonged heating with HI, all the -OH and the carbonyl groups of glucose are reduced, and the straight C6 chain survives, giving n-hexane. This established the unbranched six-carbon skeleton of glucose.

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