what are reducing centres in mono saccharides? please help

Monosaccharides are the simplest class of carbohydrates.They cannot be further hydrolyze to give smaller units.Thier general formula is (CH₂O)n,where n is 3 to 7.Glucose,fructose are the examples of monosachharides.The carbonyl group present in monosachharides are the reducing centers.Generally the carbonyl group is free which can reduce the Tollen’s reagent as well as Fehling’s solution.But when monosachharides combine to form the disachharides this carbonyl group may or may not be involved in hemiacetal linkage.If the group is involved then sugar will be non-reducing in nature and if not it will be reducing sugar.

Monosaccharides are the simplest class of carbohydrates.They cannot be further hydrolyze to give smaller units.Thier general formula is (CH2O)n,where n is 3 to 7.Glucose,fructose are the examples of monosachharides.The carbonyl group present in monosachharides are the reducing centers.Generally the carbonyl group is free which can reduce the Tollen’s reagent as well as Fehling’s solution.But when monosachharides combine to form the disachharides this carbonyl group may or may not be involved in hemiacetal linkage.If the group is involved then sugar will be non-reducing in nature and if not it will be reducing sugar.