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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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Glucose on prolonged heating with HI gives n-hexane
`HOCH_(2)CHOHCHOHCHOHCHOHCHOoverset(HI("excess"))underset("Prolonged heating ")to underset("n-Hexane")(CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)CH_(3))`
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