Question

Which of the following pairs of sugars form
identical osazone derivative ?
(1) D-(+) Glucose and (+)-maltose
(2) D-(+) Glucose and D-(-) fructose
(3) D-(+) Glucose and D-(-) arabinose
(4) D-(+) Glucose and (+) lactose
​

Answer 1

Answer:

I think so it's (1) D-(+) glucose and (+) - maltose

Answer 2

Answer:

2) D-(+) Glucose and D-(-) fructose

Explanation:

Due to the same constitution and configuration at C-3, C-4, C-5, and C-6, the same osazone derivative is obtained in the case of D-glucose, D-Mannose, and D-Fructose, but different constitution and configuration at C-1 and C-2, which becomes identical by osazone formation.

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