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Any sugar that has an aldehyde or a ketone group in solution is termed a 'reducing sugar'

Glucose is a reducing because:

1: It shows a positive to Fehling's Test for reducing sugars by forming a brick red precipitate.

2: Straight chain monosaccharides can act as mild reducing agents, because the aldehyde group that is present can be oxidized to form a carboxylic acid group and also can form a carboxylate ion group in the presence of a base.

Ring form monosaccharide does not have aldehyde group thus are not consider as reducing sugars but they are readily in equilibrium with the open chain thereby becoming a reducing sugar.

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