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Carbohydrates

Osazone forma...

Question

Osazone formation involves only 2 carbon atoms of glucose because of:

A

oxidation

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B

chelation

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C

reduction

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D

hydrolysis

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Solution

The correct option is B chelation
D-glucose reacts with one molecule of phenyl hydrazine to form D-glucose phenyl hydrazone. Second molecule of phenyl hydrazine oxidizes second C atom from alcohol to keto group. Third molecule of phenyl hydrazine reacts to form D-glucosazone.

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Similar questions

Q. Assertion :When the ketohexose, D() fructose is treated with phenyl hydrazine it produces an osazone that is identical with the one prepared from either D-(+) glucose or D-(+) mannose. Reason: Sugars forming same osazone have different configuration

C_{1}

C_{2}

that are involved in osazone formation, the rest four carbon atoms (

C_{3}, C_{4}, C_{5} a n d C_{6}

are same) are identical. Since all belongs to D-Family hence the configuration of last but one asymmetric carbon atom would be the same

The number of phenylhydrazine molecules required for $1 m o l e c u l e$ of glucose osazone formation is:

Q. D-Glucose, D-Mannose and D-Fructose from same osazone on reaction with phenylhydrazine because they have same configuration at carbons

x, y

z

x + y + z = ?

Q. In the formation of osazone derivatives of aldohexoses and ketohexoses, the carbon atom (s) that participate(s) in the reactions is.

Q. The hydroxyl group at which carbon is involved in ring formation of glucose?

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