Exams › JEE Main › Chemistry

How many molecules of phenylhydrazine are required for one molecule of glucose to form osazone?

1. three
2. two
3. one
4. four

Correct answer: three

Solution

Glucose reacts with 3 molecules of phenylhydrazine to form the osazone: one forms the hydrazone at C1, a second oxidizes C2 (acting as oxidant, reduced to aniline + NH3), and a third condenses with the resulting C2 keto group. Net: 3 phenylhydrazine per glucose.

Related JEE Main Chemistry questions

• Table sugar is classified as a
• Which pair of compounds will both produce a positive result with Tollens’ reagent?
• The process of breaking down sucrose by hydrolysis is known as
• Identify the statement that is incorrect.
• How many amino acids present in proteins can be produced by the human body itself?
• Amylose is chemically a ________ made up of about 200–1000 α-D-(+)-glucose units joined through ______ glycosidic bonds.

⚔️ Practice JEE Main Chemistry free + battle 1v1 →