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Classification of Polysaccharides Based on Composition

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Explain with structures how the osazones of glucose, fructose and mannose are identical.

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Q. Same osazone derivative is obtained in case of D-glucose, D-mannose and D-fructose, due to:

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. 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

Q. Glucose, mannose and fructose give identical osazones.

If true enter 1,if false enter 0.

Q. In the given Aldose which can form the same osazone
(I) D - glucose
(II) D - gulose
(III) D - mannose
(IV) D - galactose

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Classification of Polysaccharides Based on Composition

Standard XII Biology

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