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Glands Associated with Digestive System

Which of the ...

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Which of the following hexoses will form the same osazone when treated with excess phenyl hydrazine? (a) D-glucose, D-galactose and D-talose (b) D-fructose, D-mannose and D-galactose (c) D-glucose, D-mannose and D-galactose (d) D-glucose, D-fructose and D-mannose

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

$G l u c o s e$ $+ C H_{3} O H H C l (g) \to$	(1)Mannose
$S u c r o s e$ $+ H_{3} O^{+} \to$	(2) Galactose
$F r u c t o s e$ $B a s e \to$	(3) Glucose
$L a c t o s e$ $+ H_{3} O^{+} \to$	(4) Fructose
	(5) Glucoside

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

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