Q1 / 180 · COMEDK 2023 (Memory Based) · Chemistry

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

A
D-glucose, D-fructose and D-galactose
Correct answer
B
D-glucose, D-fructose and D-mannose
C
D-glucose, D-mannose and D-galactose
D
D-fructose, D-mannose and D-galactose

Solution

D-glucose, D-fructose and D-mannose form the same osazone treated with excess phenyl hydrazine because they differ only Ist and 2 nd carbon atoms which are transformed to the same form.

They form same osazone

Hence, the correct answer is option: 'B'.

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