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Question:

Write a reaction which shows that all the atoms in glucose are linked in a straight chain.

Solution:

(CHO|C|HOH)4CH2OH + HI ∆ → CH3−CH2−CH2−CH2−CH2−CH3 (n-hexane)
The reaction of glucose with HI gives n-hexane which shows that all the atoms in glucose are linked in a straight chain.