# Question #627ef

functional groups like $- O H , - C H O , - C O -$ are present in carbohydrates.
commonly two functional are present in a carbohydrate,$- O H \mathmr{and} - C H O , \mathmr{and} - O H \mathmr{and} - C O -$. Aldose shows different reactions and test like Tollen's silver mirror test, felling's test.
different types of reactions are also shown by carbohydrates like Osazone synthesis, length increasing reaction, oxidation reactions. These are all due to the presence of the functional groups like $- O H , - C H O , - C O -$.