Prashnikaप्रश्निका
‹ Back to the paper

Answer the following.

Write a balanced chemical reaction of D-glucose with excess of phenyl hydrazine.

Chemistry20251.5 marksReaction
Figure for this question

Answer

Answer

AI

Equation: $\mathrm{C_{6}H_{12}O_{6}} + 3\mathrm{C_{6}H_{5}NHNH_{2}} \longrightarrow \mathrm{C_{18}H_{22}N_{4}O_{4}} + \mathrm{C_{6}H_{5}NH_{2}} + \mathrm{NH_{3}} + 2\mathrm{H_{2}O}$

Reaction: Osazone formation

Product: glucosazone

D-glucose reacts with three molecules of phenylhydrazine: the first forms the phenylhydrazone, the second oxidises the neighbouring $-\mathrm{CHOH}$ group (itself reduced to aniline and ammonia), and the third condenses to give glucosazone.
Carbohydrates

From ISC 2025 Practice Chemistry, question 69(b).