Two glucose molecules are linked by α- 1, 4- glycoside bond to form disaccharide.

Reducible: it can react with silver mirror and is a reducing sugar. It can also reduce bromine to make bromine water fade.

Without ionization, hydrolysis is catalyzed by acid, and end-group isomerization can be catalyzed by alkali.

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sucrose

Non-reducing disaccharide formed by condensation of glucose and fructose with anomeric hydroxyl groups. It will not ionize.

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There are pictures and truths about glycosidic bonds in the encyclopedia.