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Question

Which reagent can differentiate propanal from propanone?

A
Schiff's reagent
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B
NaHSO3
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C
2,4dinitrophenyl hydrazine
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D
NaCN/HCN
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Solution

The correct option is A Schiff's reagent

Schiff's reagent can be used to differentiate between aldehyde and ketones. Fuschsine or rosaniline hydrochloride is a magenta-colored dye with a chemical formula C20H20N3.HCl, which is decolorized by sodium bisulfate

Propanal and Propanone : These two are distinguished by Schiff's reagent test. Propanal which is aldehyde gives magenta color with this reagent whereas propanone i.e. ketone doesn't give. Because this nucleophile is extremely bulky, a ketone, which is more sterically crowded than an aldehyde at the carbonyl carbon, does not react with Schiff's reagent, and thus does not produce the magenta color.

Hence option A is the correct answer.

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