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Write short notes on the following Mau...

Write short notes on the following
Maustard oil reaction

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(a) When primary amines are treated with carbon disulphide `(CS_2)`, N - alkyldithio carbonic acid is formed which on subsequent treatment with `HgCl_2` gives an alkyl isothiocyanate.

(b) When aniline is treated with carbon disculphide, or heated together, S-diphenylthio urea is formed HCl, phenyl isothiocyante (phenyl mustard oil), is formed.

These reactions are known as Hofmann - Mustard oil reaction. This test is used to identify the primary amines.
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