Question

why do glucose and Fructose identical osazone

Answer 1

Why are glucose and fructose in the same osazone?

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Osazones are formed when sugars react with excess phenylhydrazine. This was developed by German scientist Emil Fischer to identify sugars whose stereochemistry differed by just 1 chiral carbon.

Osazones are formed only by reducing sugars. Osazones are highly coloured and crystalline compounds and can be easily detected. Each sugar has a characteristic crystal form of osazones.

Maltose - petal-shaped crystals
Lactose - powder puff-shaped crystals
Galactose - rhombic-plate shaped crystals
Glucose, fructose and mannose - needle-shaped crystals
D-Glucose, D-fructose and D-mannose form the same D-Osazone(as shown in the figure below) because the difference between the C-1 and C-2 between these 3 sugars(Shown in figure above) is masked when osazones crystals are formed.