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Oxidation of Alkenes

A mixture of ...

Question

A mixture of 1 mole of ethanal and 1 mole of propanal when reacted with $I_{2} / N a O H$ gives a yellow precipitate. The final mixture will contain ______ moles of iodoform.

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Solution

Ethanal reacts with halogens in presence of alkali to form haloform. This reaction is called haloform reaction.
Propanal does not gives haloform reaction. Hence, this reaction can be used to distinguish ethanal and propanal

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