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Question

Schiff's reagent is used for the detection of :

A
C=C bond
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B
saturated bonds
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C
CHO group
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D
>C=O group
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Solution

The correct option is C CHO group
When sulphur dioxide gas is passed through a magenta colored solution of p-rosaniline hydrochloride, a colourless solution known as Schiff's reagent is obtained. It oxidizes the aldehyde. Due to this, the magenta colour of the solution is restored. Hence, Schiff's reagent is used for the detection of aldehyde group.

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