The correct observation in the following reactions is: Sucrose Hydrolysis A + B Seliwanoff's Reagent
Biomolecules · Class 12 · JEE Main Previous Year Question
The correct observation in the following reactions is:
- a
Gives no colour
- b✓
Formation of red colour
- c
Formation of violet colour
- d
Formation of blue colour
Formation of red colour
Step 1: Sucrose Hydrolysis — Hydrolysis of sucrose yields a mixture of glucose (an aldose) and fructose (a ketose).
Step 2: Seliwanoff's Reagent Basis — This test distinguishes between aldoses and ketoses based on their rate of dehydration to furfural derivatives.
Step 3: Resulting Observation — Ketoses (like fructose) react much faster with resorcinol in acidic conditions to produce a cherry-red color. Hence, a red color is formed.
Remember: A positive is specifically used to detect keto-sugars.
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