JEE Main Chemistry question

[Manipal 2010] Which of the following hexoses will form the same osazone when treated with excess phenylhydrazine?

(A)D-glucose, D-fructose and D-galactose
(B)D-glucose, D-fructose and D-mannoseCorrect
(C)D-glucose, D-mannose and D-galactose
(D)D-fructose, D-mannose and D-galactose

Answer: (B)

Solution

Osazone formation involves only C1 and C2 of a sugar; two sugars give the identical osazone if they have the same configuration at every carbon from C3 onward, differing only at C1 and/or C2. D-glucose, D-mannose (C2 epimer of glucose) and D-fructose (differing

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-150629