The general test for detection of carbohydrates is:
Molisch test: It is a general test for the detection of carbohydrates. The strong H2SO4 hydrolyses carbohydrates (poly and disaccharides) to liberate monosaccharides. The monosaccharides get dehydrated to form furfural (from pentoses) or hydroxy methyl furfural (from hexoses) which condense with α-naphthol to form a violet colored complex.
Iodine test
Molisch test
Barfoed test
Osazone test