On prolonged heating with HI, glucose gives n-hexane. This shows that glucose
A. contains an aldehyde group
B. has all six carbon atoms in a straight chain
C. exists in a cyclic hemiacetal form
D. contains five hydroxyl groups
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Answer: B. has all six carbon atoms in a straight chain
Complete reduction to n-hexane shows that the six carbons form an unbranched chain.
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· 23 Oct 2026
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