The correct observation in the following reaction is:

Sucrose A + B ?

Question

The correct observation in the following reaction is:

Sucrose  A + B  ?

Canvas Classes · Accepted Answer

Reaction analysis:

Step 1: Sucrose hydrolysis gives:

Step 2: Seliwanoff's test on the mixture

Seliwanoff's test:
- Reagent: Resorcinol in HCl
- Ketoses (fructose) give a cherry-red colour rapidly (within 2 minutes)
- Aldoses (glucose) give only a faint pink after prolonged heating

Since the hydrolysis mixture contains fructose (a ketose), it gives a positive Seliwanoff's test → cherry-red colour.

Why not other colours:
- Blue: iodine test for starch
- Violet: Biuret test for proteins
- No

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