Chemistry - Biomolecules Question with Solution | TestHub

Both aldoses (glucose) and fructose can reduce Tollen’s reagent. So option$\left(\mathrm{D}\right)$is correct.
In other options only 1 can do it for example in option$\left(\mathrm{a}\right)$glucose, in option$\left(\mathrm{b}\right)$fructose and option$\left(\mathrm{c}\right)$only hexanal. Fructose can reduce Tollen's reagent due to its enolisation.