Solutions of glucose and fructose are given. how can you define each of them?

| April 12, 2021 | education

Solutions of glucose and fructose are given. how can you define each of them? Write the equations for the corresponding reactions.

Glucose has an aldehyde group – СОН, therefore it is characterized by reactions for this group, as well as for aldehydes. A qualitative reaction to the -СОН – group is the reaction of the “silver mirror” and the reaction with copper (II) hydroxide.

Fructose does not have such a group, these reactions are not typical for it.

When glucose is oxidized with an ammonia solution of silver oxide, silver is deposited on the walls of the test tube.

When interacting with a blue solution of copper (II) hydroxide, a red precipitate is formed – copper (I) oxide.

СН2ОН – (СНОН) 4 – СОН + 2 Сu (OH) 2 → CH2OH- (CHOH) 4 –COOH + Cu2O ↓ + H2O.

СН2ОН – (СНОН) 4 – СОН + Ag2O → CH2OH- (CHOH) 4 –COOH + 2Ag ↓.



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