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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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On prolonged heating with HI, glucose gives n - hexane.
`"Glucose "overset(HI)underset(Delta)rarr underset("n - Hexane")(CH_(3)-CH_(2)-CH_(2)-CH_(2)-CH_(3))`
This suggests that all the six carbon atoms are in a straight chain.
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