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

 

Ans. Glucose on heating with HI produces n-hexane.

CHO
|
CHOH4HICH3-CH2-CH2n-hexane-CH2-CH2-CH3
|
CH2OHGlucose

This suggests that the six carbon atoms of glucose are linked in a straight chain.