JEE Main levelSingle correct optionDifficulty 2 of 3bm030
A sucrose solution gives a negative Fehling test. After boiling with dilute HCl and neutralising, it gives a positive test. This is because
Asucrose is oxidised by HCl
BHCl converts sucrose into maltose
Chydrolysis releases glucose and fructose, which can act as reducing sugars
Dfructose is a non-reducing sugar
Answer: C
Acid hydrolyses the glycosidic bond, giving glucose and fructose with free hemiacetal and ketol groups. Both reduce Fehling solution (fructose via enediol in the alkaline medium).