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(D) The test described is the carbylamine test,which is a characteristic reaction of primary amines ($R-NH_2$ or $Ar-NH_2$).In this reaction,a primary

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$C_6H_5CH_2NH_2$

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(D) The test described is the carbylamine test,which is a characteristic reaction of primary amines ($R-NH_2$ or $Ar-NH_2$).In this reaction,a primary amine reacts with chloroform $(CHCl_3)$ and alcoholic potassium hydroxide $(KOH)$ to form an isocyanide (carbylamine),which has an extremely unpleasant odor.Option $A$ is a secondary amine $(C_6H_5NHCH_3)$.Option $B$ is a tertiary amine $(C_6H_5N(CH_3)_2)$.Option $C$ is a quaternary ammonium salt $([C_6H_5N(CH_3)_3]^+X^-)$.Option $D$ is a primary amine $(C_6H_5CH_2NH_2)$,which will react with $CHCl_3$ and $KOH$ to give a positive carbylamine test.

The amine or salt of amine which gives a positive test with a mixture of chloroform and alcoholic $KOH$ solution is:

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