Qualitative tests for carbohydrates (Discussion)

Definitions of carbohydrates as polyhydroxy aldehydes and ketones, their role in energy production, and classification into monosaccharides, oligosaccharides, and polysaccharides.

Use of the Molisch test as a general test for all carbohydrates and the Iodine test for identifying complex carbohydrates like starch based on color changes.

Differentiating monosaccharides and disaccharides using the timed Barfoed's test and using Seliwanoff's test to detect ketoses such as fructose.

Benedict's test for identifying reducing sugars, followed by the Osazone test for confirmatory identification through microscopic crystal structure analysis.

A summary table overview of how glucose, fructose, lactose, and sucrose react across the various testing methods discussed.