Test For Simple Sugar
A brick-red precipitate is formed on boiling the solution with Fehling’s reagent. NB – All carbohydrates are dehydrated to form black carbon.
Chemistry
Test For Starch
It shows blue-black colouration when a solution of iodine is added to it.
Classification of Carbohydrate
1. Simple sugars They are crystalline, soluble in water and sweet substances. They are grouped into monosaccharides like glucose, fructose and disaccharides like maltose, sucrose etc. Monosaccharides have six carbon atoms per molecule. E.g. C6H12O6 (glucose). It turns brick red with Fehling’s solution. Monosaccharides are formed by hydrolysis of starch with dilute acid. (C6H10H5)n → …
Carbohydrates
They are organic compounds, which contain carbon, hydrogen and oxygen with hydrogen and oxygen in the ratio of 2:1 as in water. CxH2y Oy is a carbohydrate simpler form.
Alkanone
They are formed by the oxidation of secondary alkanols.
Alkanal
They are formed by partial oxidation of primary alkanols.