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When two hexoses, such as glucose and fructose, combine, the reaction is a condensation, because a small molecule is eliminated:

glucose + fructose → sucrose + water

More specifically, when the small eliminated molecule is water, it is a dehydration reaction.

(The water is formed when a hydroxyl group -OH of one hexose reacts with a hydroxyl group on the other. Water is formed, and the two hexoses are combined by the remaining oxygen atom -O- )

If further sugars add to the chain, the reaction is also polymerization.

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