Reason for ketoses being oxidized in Benedict’s test while ketones are not oxidized has to be given. Concept Introduction: Benedict test is oxidation of aldehyde group present in aldoses. The reagent used contains Cu 2+ ions that is reduced to Cu + ions when treated with aldoses. A brick-red precipitate of Cu 2 O confirms the presence of aldehyde functional group . Aldehyde group is oxidized to carboxylic acid . If a hemiacetal hydroxyl group is present in the sugar then it will be a reducing sugar and the result will be positive for Benedict’s test.

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Chapter 16, Problem 16.72QP

Interpretation Introduction

Interpretation:

Reason for ketoses being oxidized in Benedict’s test while ketones are not oxidized has to be given.

Concept Introduction:

Benedict test is oxidation of aldehyde group present in aldoses. The reagent used contains Cu2+ ions that is reduced to Cu+ ions when treated with aldoses. A brick-red precipitate of Cu2O confirms the presence of aldehyde functional group. Aldehyde group is oxidized to carboxylic acid. If a hemiacetal hydroxyl group is present in the sugar then it will be a reducing sugar and the result will be positive for Benedict’s test.

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