Which of the following hexoses will form the same osazone when treated with excess phenyl hydrazine?

D-glucose, D-fructose and D-galactose

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D-glucose, D-fructose and D-mannose

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D-glucose, D-mannose and D-galactose

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D-fructose, D-mannose and D-galactose

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Solution

The correct option is B D-glucose, D-fructose and D-mannose
D-glucose, D-fructose, and D-mannose form the same osazone when treated with an excess of phenylhydrazine because they differ only in the configuration of 1st and 2nd carbon atoms which are transformed to the same form.

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