From the following compounds how many can give positive Fehling's testA) SucroseB) BenzaldehydeC) FructoseD) Formic acid

Sucrose …disaccharide….no free anomeric -OH groups….cannot give positive Fehling's test.Benzaldehye…aromatic aldehyde…cannot give positive Fehling's test.Fructose…monosaccharide…even though it is a ketose it can give positive Fehling's test due to reversible isomerisation in alkaline medium.Formicacid…contains -CHO group…can give positive Fehling's test.