Question

The correct observation in the following reactions is :
Sucrose $\underset{\text{Cleavage (Hydrolysis)}}{\overset{\text{Glycosidic bond}}{\to }}A+B\underset{\text{reagent }}{\overset{\text{Seliwanoff ’s}}{\to }}$

• A. Formation of blue colour
• B. Formation of violet colour
• C. Formation of red colour
• D. Gives no colour

Answer 1

Answer: (C)

Seliwanoff's test is used to distinguish between aldose and ketose sugars; when added to a solution containing ketose, red colour is formed rapidly.

Sucrose $\stackrel{\text{Hydrolysis}}{\to }\underset{\stackrel{+}{\mathrm{Fructose}}}{\mathrm{Glucose}}\underset{\text{reagent}}{\overset{\text{Seliwanoff’s}}{\to }}$ Red colour