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How do you explain the presence of all t...

How do you explain the presence of all the six carbon atoms in glucose in a straight chain?

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Upon prologed heating with HI in the presence of red phosphorus, glucose gives n-hexane which is a straight chain molecule. This shows that all the six carbon atoms in the glucose represent a straight chain.
`underset("Glucose")(C_(6)H_(12)O_(6))overset(HI/P)underset("Reduction")rarr underset("n-hexane")(CH_(3)CH_(2)CH_(2)CH_(2)CH_(3))`
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