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  • Which of the following sugar give a positive result with Seliwanoff test:  Option: 1 Sucrose<strong

Which of the following sugar give a positive result with Seliwanoff test:
 

Option: 1

Sucrose


Option: 2

Glucose


Option: 3

Allose


Option: 4

Mannose


Answers (1)

best_answer

Seliwanoff's test is used to distinguish aldoses and ketoses. Ketoses give positive test for Seliwanoff test. Sucrose gives positive Seliwanoff test since it contains a fructose moiety which is a ketose sugar.

The reagent for seliwanoff's test is resorcinol, HCl. While heating ketoses with seliwanoff's reagenet, the dehydration takes place which is followed by reaction with resorcinol and a condensation product (Red colour) is obtained.

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shivangi.shekhar

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