Complete the following chemical reaction:
$C_{2} H_{5} {N H}_{2} + {C S}_{2} + H g {C l}_{2} h e a t - - \to . . . . + H g S + H C l$

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Solution

Hofmann mustard oil reaction: It is given only by primary amines. Ethyl isothiocyanate (the product) has pungent smell similar to mustard oil. Hence, this reaction is test for primary amines.
$C_{2} H_{5} {N H}_{2} + {C S}_{2} + H g {C l}_{2} h e a t - - \to C_{2} H_{5} N = C = S Ethyl isothiocyanate + H g S + H C l$

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