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(B) Aniline $(C_6H_5NH_2)$ is an aromatic primary amine,while ethylamine $(C_2H_5NH_2)$ is an aliphatic primary amine.When treated with $NaNO_2 / HCl$

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Reaction with $NaNO_2 / HCl$ followed by treatment of $2-$naphthol

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(B) Aniline $(C_6H_5NH_2)$ is an aromatic primary amine,while ethylamine $(C_2H_5NH_2)$ is an aliphatic primary amine.When treated with $NaNO_2 / HCl$ at $0-5 \ ^\circ C$,aniline forms benzene diazonium chloride,which is stable at low temperatures and undergoes a coupling reaction with $2-$naphthol to form an azo dye (red color).In contrast,ethylamine forms an unstable aliphatic diazonium salt that immediately decomposes to evolve $N_2$ gas and forms ethanol,thus it does not give the azo dye coupling reaction.Therefore,the reaction with $NaNO_2 / HCl$ followed by treatment with $2-$naphthol can distinguish between them.

Among the following,the method which can be used for distinguishing aniline from ethylamine is

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