Which of the following can be detected by carbylamine reaction?

Urea

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C H_{3} C O N H_{2}

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C_{2} H_{5} N H_{2}

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All of the above

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Solution

The correct option is C $C_{2} H_{5} N H_{2}$
Carbylamine reaction is given by primary amines. It is not given by secondary or tertiary amines, amide or urea.
In Hoffmann's carbylamine test (also known as Isocyanide test), aliphatic or aromatic primary amine is heated with chloroform in presence of alcoholic potassium hydroxide to give foul smelling alkyl/aryl isocyanide or carbylamine.
$C_{6} H_{5} - N H_{2} + C H C l_{3} + 3 K O H h e a t - - \to C_{6} H_{5} - N C + 3 K C l + 3 H_{2} O$
Thus, ethylamine $(C_{2} H_{5} N H_{2})$ can be detected by carbylamine reaction.

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