Monosaccharides and disaccharides in which aldehyde group is free reduce Tollen's reagent as well as Fehling solution and hence are known as reducing sugars. Carbohydrates react with excess of phcayl kydrazine to yield their crystalline derivatives called oxazones. In osazone formation only the first two carbon atoms are irrelved Osazone on hydrolysis gives same which are reduction with `ZnCH_(3)COOH` gives a ketose sugar
The end product 'Z' in the following sequence of reactions. Glucose, `underset(("excess"))overset(Ph. NH.NH_(2))rarr X underset(Delta)overset(H_(2)O//H^(+))rarr Y overset(Zn//AcOH)rarrZ`

Options

A. Mannotol
B. Arabinose
C. Fructose
D. Ribose

Answer

C

Explanation

`underset(underset(underset(|)((CHOH)_(3)))(|))overset(overset(CHO)(|))(CHOH) overset(C_(6)H_(5)NHNH_(2))rarr underset(underset(underset(|)((CHOH)_(3)))(|))overset(overset(CH = N.NHC_(6)H_(5))(|))(CH= N.NHC_(6)H_(5)) overset(H_(3)O^(+))rarr underset(underset(underset(|)((CHOH)_(3)))(|))overset(overset(CHO)(|))(C ) = O underset(CH_(3)COOH)overset(Zn)rarr underset(underset(underset(underset(underset(("D-fructose"))(CH_(2)OH))(|))((CH_(2)OH)_(3)))(|))overset(overset(CH_(2)OH)(|))(C ) = O`