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4.1.2 Monosaccharides. In general all monosaccharides are soluble in water, sparingly soluble in ethanol and insoluble in ether, are optically active, possess reducing properties (ie. reduce Fehling's solution), can be represented by the general formula C x H 2x O x, and generally possess a sweet taste.
OPTICALLY ACTIVE SUGARS. The property pos sessed by sugars of rotating the plane of polar ized light to the right or left when passed through their solutions has long served as a basis for classification. Sugars possessing this prop erty are said to be optically active.and those which do not are said to be inactive.