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D-glucose reacts with phenylhydrazine to...

D-glucose reacts with phenylhydrazine to make osazone. How many moles of phenylhydrazine is used for this reaction per molecule of D-glucose?

A

1

B

2

C

3

D

7

Text Solution

Verified by Experts

The correct Answer is:
C
When glucose is warmed with excess phenyl hydrazine, it forms phenyl hydrazone by condensation with aldehydic group. However, the reaction does not stop here, instead, another mole of phenyl hydrazine oxidises the adjacent - CHOH group to get reduced into aniline and ammonia. The resulting carbonyl group will react with third mole of phenyl hydrazine to form the final product glucosazone. The reaction follows nucleophilic addition mechanism:
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Knowledge Check

  • D-glucose reacts with phenylhydrazine to make osazone. How many molecules of phenylhydrazine are used for this reaction per molecule of D-glucose?

    A
    One
    B
    two
    C
    three
    D
    four

  • How many molecules of phenyl hydrazine are used up per molecule of glucose?

    A
    1
    B
    2
    C
    3
    D
    6

  • Glucose reacts with excess of phenylhydrazine and forms

    A
    Glucosazone
    B
    Glucose phenylhydrazone
    C
    Glucose oxime
    D
    Sorbitol
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