One of the most popular tests used for the estimation or detection of reducing sugars and non-reducing sugars is the Fehling’s test. This also used to differentiate between ketone functional groups and water-soluble carbohydrates. Write an article of about 1000 words explaining the procedure, chemical reactions and common uses of this test.

Carbohydrates are classified on the basis of their behaviour on hydrolysis and also as reducing or non-reducing sugar. Sucrose is ............. .
(a) monosaccharide (b) disaccharide
(c) reducing suager (d) non-reducing sugar

In disaccharides, if the reducing groups of monosaccharides, i.e., aldehydic or ketonic groups are bonded, these are non-reducing sugars. Which of the following disaccharide is a non-reducing sugar?