In the Hofmann mustard oil reaction of primary amines, the black precipitate is due to:

H g S

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A g_{2} S

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C u S

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B a S

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Solution

The correct option is B $H g S$
In the Hofmann mustard oil reaction of primary amines, the black precipitate is due to HgS. It is a test of primary amine.

Primary amine gives alkyl isothiocyanate having mustard oil like smell.

$R N H_{2} + C S_{2} \to S = C (S H) - N H R H g C l_{2} - --- \to R N C S + H g S + 2 H C l$

Option A is correct.

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Similar questions

Primary amine on heating with $C S_{2}$ followed by excess of mercuric chloride gives Isothiocyanate. The reaction is called

P b S, C u S, H g S, M n S, A g_{2} S, N i S, C o S, B i_{2} S_{3}

_{2}

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C u S, {A g}_{2} S, H g S

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