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The correct observation in the following reaction is:

$\require{mhchem}\ce{Sucrose->[\text{Gly cosidic bond}][\text{Cleavage (Hydrolysis)}]A + B->[\text{Seliw anoff}][\text{Reagent}]?}$

(1) Formation of blue colour

(2) Formation of violet colour

(3) Formation of red colour

(4) Gives no colour
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Ans. (3) Formation of red colour

Sol. Seliwanoff reagent $\to$ [Resorcinol + Conc. HCl]

Use of Seliwanoff reagent is to distinguish aldoses and ketoses. Ketoses show red colour with Seliwanoff Reagent.

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