n-Hexane is obtained when glucose is

Prolonged heated with HI

The correct answer is Option (1) → Prolonged heated with HI

• When glucose is prolongedly heated with hydroiodic acid (HI), it undergoes reductive cleavage.
• All hydroxyl groups (–OH) in glucose are replaced by hydrogen atoms, resulting in the formation of an alkane with the same number of carbon atoms as glucose.
• Glucose has 6 carbon atoms → the product is n-hexane.

Other options:

• Hydroxylamine → forms oximes.
• Bromine water → mild oxidation of aldehyde to acid.
• Acetic anhydride → forms acetate esters.