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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.
Monosaccharides are the simplest form of carbohydrates and may be subcategorized as aldoses or ketoses. The sugar is an aldose if it contains an aldehyde functional group.A ketose signifies that the sugar contains a ketone functional group.etroses are monosaccharides with four carbon atoms. An aldotetrose has an aldehyde functional group at carbon number one. The two common types of aldotetroses are D-Erythose and D-Threose. The D configuration is more favor.